Atmel AVR2042: REB Controller Base Board
Contents
1. Parameter Condition Minimum Typical Maximum 7 1 1 Storage temperature range 40 85 C 7 1 2 Relative humidity Non condensing 90 r H 7 1 9 Supply voltage 0 3 3 6 V 7 1 4 EXT I O pin voltage 0 3 Veco 0 3 V 7 1 5 Supply current from batteries Sum over all power pins 0 5 A 7 1 6 Battery charge current 0 mA Note 1 Keep power switch off or remove batteries from REB CBB when external power is supplied 7 2 Recommended operating range Table 7 2 Recommended operating range Parameter Temperature range Condition Minimum Typical Maximum Plain REB CBB Supply voltage Vcc REB plugged on REB CBB 7 3 Current consumption Table 7 3 Current consumption of REB CBB populated with REB231 Serial flash access in usage Test conditions unless otherwise stated Vop 3 0V Top 25 C Table 7 3 lists current consumption values for typical scenarios of a complete system composed of Atmel REB CBB and Atmel REB231 The Z diode has been removed as described below Parameter Supply current Condition MCU power down transceiver in state SLEEP serial flash in Deep Sleep Minimum Typical Maximum Supply current MCU 2MHz transceiver in state TRX_OFF 14 Supply current Atmel AVR2042 MCU 16MHz int RC 32MHz transceiver in state TRX_OFF 8334B AVR 05 12 Parameter Supply current Atm2. O OINI DD Oa BRI WIN gt U TI gt SIE lwo lo le 5 lt e The Atmel REB CBB is populated with a 4MBit serial flash device Atmel AT25DF041A for persistent data storage It is capable of storing one complete firmware image of the Atmel ATxmega256A3 which makes it suitable for over the air upgrades OTA It is connected to SPID PD4 7 Table 5 9 Serial flash connection ATxmega256A3 AT25DF041A PD4 30 The AT25DF041A supports SPI frequencies of up to 50MHz at supply voltages down to 2 3V When operating the board below 2 3V the serial flash cannot be accessed see datasheet 3 for more information ATMEL e ATMEL Table 5 10 AT25DF041A ordering information AT25DF041A SSHF T 4MBit SOMHz 2 3V 3 6V 851 SOP 8 40 C 85 C 5 6 UART JUSART 10 Atmel AVR2042 The signal lines for asynchronous serial operation using USARTDO of the Atmel ATxmega256A3 are connected to header USARTDO In addition the MCU reset line is connected to pin 5 of this header This can be used to work with a serial boot loader No level conversion is done therefore an external RS232 TTL conversion circuit is required The header pin out mates with the available RS232 TTL converter art no de28560 Table 5 11 Connection of USARTDO ATxmega256A3 Header USARTDO Description PD2 28 RxD 4 Asynchronous serial in PD3 29 TxD 1 Asynchronous serial out RESET 57 RESET 5
3. a Sk Oo o O tO Sol Wi gert cl DL 6 Vie E MN gt ZFDI89L Z Z YIOV3H Ss PX dez 4 MZ EX it L a z Lo LOSOL ie He puedxg CH ONG ONE AND AND aA VIPOACSZLY ON zxe Y30Y3H IS ONS d a lt 9 e MOS d L Za eo o SE Aosan OHH os Ke 019 09587 IN HV ep Jepuemjabed ZEZSY A0 bp 22A oaLevsn zn SIA 8 Z 9 S v z L Appendix A PCB design data A 1 Schematic 17 IMEL F E 8334B AVR 05 12 A 2 Assembly drawing 18 Atmel AVR2042 ATMEL Figure 8 2 Assembly top Expandi m N 2 S 2 S 0 SE be Beer E Figure 8 3 Assembly bottom ON ww Wi e Ci1 Ke ES D4 G 8334B AVR 05 12 A 3 Bill of materials Atmel AVR2042 Designator Description Value Manufacturer Part number Comment BT1 Battery holder 2 x AAA BH 421 3 C2 Capacitor 10nF C3 C4 Capacitor 2 2pF C5 C6 C7 Capacitor 100nF C8 C9 C10 C11 C12 C13 Capacitor 10uF C14 C15 D1 D2 D3 LED red WU 2 69HD LC D4 Schottky diode Vishay BAS40 00 43 DBG Header 5 x 2 100mil PORTA PORTE PORTF DBGSEL Header 3 x 1 100mil Expand Header female 20 x 2 100mil L1 Inductor PWR Header 2 x 1 100mil Q1 Quartz 32 768kHz R1 R2 R3 Resistor 470Q R4 Resistor 10kQ RST T1 Pushbutton Sw Switch single pole U1 8 16 bit AVR XMEGA microcontroller ATxmega256A3 Atmel ATxmega256A3 MH U2 4M
4. Atmel AVR2042 REB Controller Base Board ANEI IMEL Hardware User Manual Features e High performance low power 8 16 bit Atmel AVR XMEGA ATxmega256A3 microcontroller 256KB in system self programmable flash 8KB boot code section with independent lock bits 16KB internal SRAM 4KB EEPROM e 4Mb serial flash for support of over the air OTA upgrades e Programming interface e Fully functional wireless node in combination with the Atmel Radio Extender Board REB e Powered by two AAA batteries for stand alone operation 1 Introduction This application note describes the Atmel REB Controller Base Board REB CBB Detailed information about its functionality its interfaces the microcontroller programming and the PCB design is given in the individual sections The REB CBB is intended to serve as a microcontroller platform for the Atmel Radio Extender Board REB family The REB connected to a REB CBB forms a battery powered fully functional and portable wireless node Figure 1 1 REB controller base board ede 3000900000278 E eaocan ang 574 9900 B C EI Oo 8 bit Atmel Microcontrollers Application Note Rev 8334B AVR 05 12 2 Disclaimer 3 Overview 2 Atmel AVR2042 AIMEL T C Typical values contained in this application note are based on simulations and on testing of individual examples Any information about third party materials or parts is included in this
5. Serial MCU 2x20 REB Expansion The board is powered by two AAA batteries The power switch SW1 disconnects batteries from the entire board External power is not routed through the power switch For debugging and test purposes power can also be supplied at pin header PWR There is no protection against over voltage Take care when applying power from an external source Refer to Section 7 1 for allowable input voltage range Exceeding these limits may destroy the board In addition avoid applying reverse currents into batteries by switching SW1 to the off position or by removing the batteries when using external power Figure 5 2 Power supply of the REB CBB ie VTG 2xAAA EA PWR GND The Atmel XMEGA A3 is a family of low power high performance and peripheral rich CMOS 8 16 bit microcontrollers based on the AVR enhanced RISC architecture By executing powerful instructions in a single clock cycle the Atmel XMEGA A3 achieves throughputs of up to 1 million instructions per second MIPS per MHz allowing the system designer to optimize power consumption versus processing AMEL s ATMEL speed A detailed description of the Atmel ATxmega256A3 can be found in the datasheet 2 Table 5 1 Alxmega256A3 ordering information ATxmega256A3 AU 256KB 8KB 16KB 1 6V 3 6V 64A TQFP 64 40 C 85 C 5 3 Clock sources 5 3 1 32kHz crystal oscillator NOTE 6 Atmel AVR2042 The XMEGA has a flexible cl
6. 487 2600 HONG KONG GERMANY Tel 81 3 6417 0300 www atmel com Tel 852 2245 6100 Tel 49 89 31970 0 Fax 81 3 6417 0370 Fax 852 2722 1369 Fax 49 89 3194621 O 2012 Atmel Corporation All rights reserved Atmel Atmel logo and combinations thereof AVR XMEGA S and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries Other terms and product names may be trademarks of others Disclaimer The information in this document is provided in connection with Atmel products No license express or implied by estoppel or otherwise to any intellectual property right is granted by this document or in connection with the sale of Atmel products EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT INDIRECT CONSEQUENTIAL PUNITIVE SPECIAL OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS AND PROFITS BUSINESS INTERRUPTION OR LOSS OF INFORMATION ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Atmel makes no representations or warranties with respect to the accuracy or completenes
7. document for convenience The vendor may have changed the information that has been published Check the individual vendor information for the latest changes The Atmel REB CBB is designed to interface directly to a radio extender board The combination of the two boards form a battery powered fully functional portable wireless node The setup provides an ideal platform to e Evaluate the outstanding performance of the Atmel radio transceivers e Test the unique radio transceiver hardware support for the IEEE 802 15 4 standard 1 e Test the enhanced radio transceiver feature set e Develop applications capable of hosting a ZigBee stack Table 3 1 lists the available radio extender boards and related radio transceivers Table 3 1 Supported radio extender boards REB231FE2 Antenna diversity AT86RF231 ATREB231FE2 EK front end module REB232ED Antenna diversity AT86RF232 ATREB232ED EK REB233SMAD Antenna diversity AT86RF233 ATREB233SMAD EK SMA connector Note 1 Currently there exists no Evaluation Kit but the plain radio extender is purchasable from http www dresden elektronik de shop The REB CBB is assembled with an 8 bit Atmel AVR ATxmega256A3 microcontroller It offers a connector for programming and debugging suitable to connect an Atmel AVR JTAGICE mkll programmer A connector to attach an asynchronous serial interface allows interfacing to a PC host for control and data exchange tasks Figure
8. 3 1 shows a development and evaluation setup using the REB CBB in combination with the REB231ED radio extender board 8334B AVR 05 12 Atmel AVR2042 Figure 3 1 Atmel REB CBB connected to an Atmel REB231ED with an RS232 cable plugged in and an Atmel AVR JTAGICE mkli programming interface ATMEL E 8334B AVR 05 12 AIMEL a C 4 Mechanical description The REB CBB is manufactured using a two layer printed circuit board PCB All active components are mounted on the bottom side and all connectors and user I Os are located on the top side using through hole components The radio extender board is plugged into the 2 x 20 female header Expand1 vertically Figure 4 1 Mechanical outline wf el Leg eg eg eg eg eal 60mm 70mm bet e Je ke wei be Tie el ei Bel kee eg ef e eg Zeg we 18mm Table 4 1 REB CBB mechanical dimensions Dimension Width x Width y PCB standoff height Height without REB Height with REB231ED plugged in 4 Atmel AVR2042 8334B AVR 05 12 Atmel AVR2042 5 Functional description 5 1 Power supply NOTE 5 2 Microcontroller 8334B AVR 05 12 The Atmel REB CBB carries a high performance Atmel AVR XMEGA microcontroller which connects to the radio extender board and various peripheral units See Figure 5 1 It is powered by two AAA batteries or optionally by applying an external voltage source Figure 5 1 REB CBB block diagram
9. CT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES No license is granted under any patent right or other intellectual property right of Atmel covering or relating to any machine process or combination in which such Atmel products or services might be or are used Mailing Address Atmel Corporation 2325 Orchard Parkway San Jose CA 95131 Copyright 2012 Atmel Corporation 8334B AVR 05 12 References 1 2 Atmel AVR2042 IEEE Std 802 15 4 2006 Wireless Medium Access Control MAC and Physical Layer PHY Specifications for Low Rate Wireless Personal Area Networks LR WPANSs Atmel ATxmega256A3 High performance Low power 8 16 bit AVR XMEGA Microcontroller datasheet rev 8068P 02 10 Atmel Corporation 3 Atmel AT25DF041A 4 Megabit 2 3 volt or 2 7 volt Minimum SPI Serial Flash Memory datasheet revision D September 2008 Atmel Corporation 4 RS232 Level Shifter datasheet 02 11 Dresden Elektronik Ingenieurtechnik gmbh 9 USB Level Shifter Stick Basic datasheet 03 12 Dresden Elektronik Ingenieurtechnik gmbh Revision history REB Controller Base board A09 1258 01 Initial release A09 1258 02 Not released A09 1258 03 Not released A09 1258 04 Replacement of U2 Serial Data Flash AT25DF021 SSHF by AT25DF041 SSHF crystal Q1 and load capacitors C3 C4 8334B AVR 05 12 AIMEL 21 E Table of contents 22 Atmel AVR2042 Ann PP 1 1 Introducti
10. JOY WL Atmel AVR2042 IC schemat Figure 8 1 Te ONS 007 UND zgeg EEGEN Seet Ee 2H 6 Cd ONG Na o O Vd ONS a P CNS SVd 9Vd Je 0ad Lad Zed 2A ad IIN vad DOA 359 uoNonpoid SES E paseq aJemypos ajqeua o suid Dav 0 peyeuUO SCT anyoe yBiy 8d Lose 09d CNS LX NISY EI aise gor Zhe boy DINN PET SL 138980 Zei Od aildis 6l pod da T Nas oz Wee Zoe e ISOW re ZXG YIOVIH OSIN SH MA ano J of et HOS Ee e 8 2 05 Tsuon a SNL mo Se da E OL MOXL SC vdd ano o z ic Seng Zdd 4 dd SPedaplosanem dijo oad ez oe Sad o 9dd Odd Lee ss 222 DW L E Z wo r d 6S LIX s900e dd Z T uolpajas od Bnqap IIAW 3D19VLE el ZGES ee 1d ZXS YIOVIH ISyon ak a pr a E ONS ONS a Baa SE Ze 2008 VIZ Elz Gad Z9 wwg wwg wwg JER aN Bee aa amp ZS 18890 a ZZ WZ OZ OL 1SH ano 6861 UN copa RS ZX0Z YIOV3H ZER ldd val ev 00 0rvSva Lv96z O ob 68 gt Zdd 00 0S2 00 9 or S cde JE OX dd ul cl 98 se OC vdd OLA OLA vZ q be ee OX Sid GER eg le Oo 94d wwz e XSZN SZN Joe eer ddd geg eg WZS NIJS Aoo oe Es T En ISON Joa g OSIN S967 e a Z DIER A S NISY evoszeBoux Ly MOXL gt umes in ONS zz kz Jan Se SL o 6 p J91A BL 10 a
11. MCU reset VTG 2 Operating voltage GND 6 Ground Synchronous operation is not supported at this connector since the clock line at PD1 27 is already in use to control the TXCW pin when the Atmel AT86RF230 is connected However in addition all interface pins for USARTEO and USARTFO are accessible for all operating modes including SPI PC connectivity can be easily achieved by using either a RS232 level shifter cable 4 as shown in Figure 5 6 or by using a serial to USB level shifter stick 5 as shown in Figure 5 7 These adapter cables are provided with Atmel kit deliveries as listed in Table 3 1 Figure 5 6 RS232 level shifter cable 8334B AVR 05 12 Figure 5 7 USB level shifter stick AIMEL 11 E 8334B AVR 05 12 6 Programming NOTE 12 Atmel AVR2042 ATMEL On the Atmel ATxmega256A3 both programming and debugging can be done through two physical interfaces The primary interface is the program and debug interface PDI This is a two pin interface using the reset pin for the clock input PDI_CLK and the dedicated test pin for data input and output PDI_DATA Programming and debugging can also be done through the four pin JTAG interface The JTAG interface is IEEE 1149 1 standard compliant and supports boundary scan Any external programmer or on chip debugger emulator can be directly connected to these interfaces and no external components are required The Atmel REB CBB p
12. b SPI serial flash memory AT25DF041A Atmel AT25DF041A USARTDO Header 3 x 2 100mil X1 Jumper 100mil Z1 Nut M2 5 Z2 Countersink screw M2 5 x 8 DIN965 4 8 gal ZN Z3 Nylon washer M2 5 2 mm DIN125 Z10 Z11 Rubber foot 8 0 x 2 5mm 8mm 212 213 8334B AVR 05 12 AIMEL E 19 AIMEL T C EVALUATION BOARD KIT IMPORTANT NOTICE 20 Atmel AVR2042 This evaluation board kit is intended for use for FURTHER ENGINEERING DEVELOPMENT DEMONSTRATION OR EVALUATION PURPOSES ONLY It is not a finished product and may not yet comply with some or any technical or legal requirements that are applicable to finished products including without limitation directives regarding electromagnetic compatibility recycling WEEE FCC CE or UL except as may be otherwise noted on the board kit Atmel supplied this board kit AS IS without any warranties with all faults at the buyer s and further users sole risk The user assumes all responsibility and liability for proper and safe handling of the goods Further the user indemnifies Atmel from all claims arising from the handling or use of the goods Due to the open construction of the product it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge and any other technical or legal concerns EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER USER NOR ATMEL SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRE
13. el AVR2042 Condition Minimum Typical Maximum MCU 16MHz int RC 32MHz transceiver in state RX_ON Supply current 8334B AVR 05 12 MCU 16MHz int RC 32MHz transceiver in state BUSY_TX For current consumption measurements please regard the Z diode mounted on the REB It prevents applying overvoltage stress to the radio transceiver circuit as well as protection against reverse polarity Figure 7 1 REB overvoltage protection mechanism Fl JP 1 CVTG miniSMDC020 DI BZG05C3V9 The Z diode draws approximately 6mA at 3 0V type BZG05 C3V9 which should be considered in overall current consumption The Z diode shall be removed for low power designs or in case of current measurements AIMEL 15 E 8 Abbreviations 16 Atmel AVR2042 CLKM DBG EMI JTAG MCU OTA PDI PLL REB REB CBB RTC SPI UART USART AIMEL T C Transceiver clock Debug interface Electromagnetic interference Joint Test Action Group Microcontroller Unit Over the air upgrades Program debug interface Phase locked loop Radio extender board REB controller base board Real time counter Serial peripheral interface Universal asynchronous receiver transmitter Universal synchronous asynchronous receiver transmitter 8334B AVR 05 12 Doug PieOgeseAIeTONUOD gen 2am2 I Jor mom Hottua ZL0 On ad paeogeseqialjou0g gay Wd ey as PADOJOSDJAD ONHUO
14. nd they are listed in Table 5 4 Table 5 4 REB specific CLKM solder jumpers REB name Solder jumper designator REB REB230 REB231 REB231ED REB212 REB232ED REB231FE2 For simple applications and debugging purposes or just to deliver status information a basic user interface is provided directly on the board consisting of three LEDs and a pushbutton AMEL r ATMEL Figure 5 4 User I Os PB3 The LEDs are connected to PBO 2 for active high operation The key will pull PB3 to GND The key is intended to be used in combination with the internal pull up resistor Table 5 5 LED Button connection ATxmega256A3 UO PBO 6 D1 PB1 7 D2 PB2 8 D3 PB3 9 T1 To get full accessibility to all I O pins of the Atmel ATxmega256A3 three 8 bit ports are routed to 10 pin headers Each header provides additional pins for VTG and GND Figure 5 5 shows the pin out for a single port Figure 5 5 General pin out of I O port headers 1 2 Px0 Px1 Px2 Px3 Px4 Px5 Px6 Px7 GND VTG PORTx Table 5 6 PORTA header connection Header PORTA ATxmega256A3 PAO 62 O0 O NJ O OI B OQOQ N O Atmel AVR2042 8334B AVR 05 12 5 5 Serial flash 8334B AVR 05 12 Atmel AVR2042 Table 5 7 PORTE header connection Header PORTE ATxmega256A3 PEO 62 1 2 3 4 5 6 T 8 9 O
15. ock system supporting a large number of clock sources It incorporates both calibrated integrated oscillators and external crystal oscillators and resonators The Atmel AVR XMEGA family allows dynamic switching between the clock sources Internal clock sources are e 32kHz RC oscillator e 2MHz RC oscillator e 32MHz RC oscillator The 2 32MHz oscillators can be calibrated using an automatic runtime calibration feature In addition to the internal clock sources two different external clock sources are supported e The 32 768kHz crystal oscillator connected to TOSC1 2 delivers an accurate clock for a real time counter or optionally a system clock for XMEGA e The transceiver clock CLKM can be used as an accurate clock derived from the 16MHz radio transceiver oscillator This signal is routed to the controller input at pin 59 PR1 A crystal oscillator failure monitor can be enabled to issue a non maskable interrupt and switch to internal oscillator if the external oscillator fails A high frequency phase locked loop PLL and a clock prescaler are available to generate a wide range of clock frequencies After reset the device will always start up running from the 2MHz internal oscillator During normal operation the system clock source and prescalers can be changed from software at any time The 32 768kHz crystal oscillator is a low power oscillator using an external crystal The oscillator can be used as a clock source for the sy
16. on titi aio 1 KREE E 2 3 OV CF VIO EE 2 4 Mechanical description cooccoccoccconcocconconcanconconoancancancancancancancancnnnnas 4 5 Functional dAescriptiON cooccocccccconcocconconcancanconcancancancancancancancancancnnnnn 5 A PP A 5 9 2 INIOTOCON MONO EE 5 9 9 ee Ee 6 5 93 1 OZKMZ crystal OSCINAION EE 6 5 3 2 Transceiver clock CIRMI 7 SO A PP te dcemnaaeteutoesodec addaneeninieis 7 SS EE 9 0 UAR USAR Toc 10 FOG I AIAG E 12 7 Electrical CharacteristiCs cc1cccssccseccsescsescseecnscnnscenscanseanscenseanens 14 7 1 Absolute maximum ratings vn cridsndcsenedeusdspuasncensecsied padauandewncaidassacelsaspecalisemniadsanes 14 7 2 Recommended Operating rangde 14 7 3 C rrent CONSUMO sas 14 8 Abbreviations ccscccseccseccnnscsnecneeenscnscnseanensnsenscenscanscansnenssnssenssanss 16 Al o PPP A 17 AZ Assembly drawing DEE 18 PS AOR CACTI E 19 EVALUATION BOARD KIT IMPORTANT NOTICE 1 cc1sccsecseeees 20 EE 21 Revision history REB Controller Base DOaId 1sc1sccssseseeeenenees 21 TAC OF CON CIN GS coast iii ici cido 22 8334B AVR 05 12 AA Atmel Corporation Atmel Asia Limited Atmel Munich GmbH Atmel Japan 2325 Orchard Parkway Unit 01 5 amp 16 19F Business Campus 16F Shin Osaki Kangyo Bldg San Jose CA 95131 BEA Tower Milennium City 5 Parkring 4 1 6 4 Osaki Shinagawa ku USA 418 Kwun Tong Road D 85748 Garching b Tokyo 104 0032 Tel 1 408 441 0311 Kwun Tong Kowloon Munich JAPAN Fax 1 408
17. rovides a 10 pin header to connect the Atmel AVR JTAGICE mkll probe This connection can be used for both protocols JTAG and PDI Figure 6 1 Connection between JTAGICE mkll and REB CBB H t nn arr To select between one of the protocols the jumper DBGSEL has to be set to the appropriate position It routes test data input signal TDI to either TDI of the JTAG interface or PDI of the Atmel proprietary PDI interface Figure 6 2 Debug interface Atmel AVR JTAGICE mkil units with hardware revision O do not have PDI capabilities 8334B AVR 05 12 Atmel AVR2042 Table 6 1 Connection of header DBG DBG Connector DBGSEL JTAG DBGSEL PDI TMS 5 PB4 10 unused TDI 9 PDI 56 TCK 1 PB6 12 unused TDO 3 PB7 13 unused nSRST 6 RESET 57 AMEL 1 8334B AVR 05 12 AIMEL T C 7 Electrical characteristics 7 1 Absolute maximum ratings Stresses beyond those listed under Absolute maximum ratings may cause permanent damage to the board This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this manual are not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability For more details about these parameters refer to individual datasheets of the components used Table 7 1 Absolute maximum ratings
18. s of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice Atmel does not make any commitment to update the information contained herein Unless specifically provided otherwise Atmel products are not suitable for and shall not be used in automotive applications Atmel products are not intended authorized or warranted for use as components in applications intended to support or sustain life 8334B AVR 05 12
19. stem clock the RTCs and as a reference clock for the PLL A low power mode with reduced voltage swing on TOSC2 is available The 32kHz crystal is connected to PE6 7 These pins cannot be used as general purpose I O on header PORTE 8334B AVR 05 12 5 3 2 Transceiver clock CLKM 5 4 User I O 8334B AVR 05 12 Atmel AVR2042 Figure 5 3 32kHz crystal connection C3 GND TOSCI 2 2p LO 23 T68kHz C4 GND TOSC2 Ki Table 5 2 32kHz crystal connection ATxmega256A3 32kHz crystal PEG 42 TOSC2 PET 43 TOSC1 To make use of the transceiver clock CLKM an Atmel REB has to be connected to the Atmel REB CBB and the radio transceiver has to be set up properly on the REB The transceiver delivers a 1MHz clock frequency after power on Although it is possible to set the clock frequency up to 16MHz by writing to the transceiver register no frequencies above 1MHz should be used to drive the microcontroller This is because the signal is filtered directly at the output pin for EMI suppression to ensure the best RF performance of the REB To reach a system clock frequency higher than 1MHz the Atmel XMEGA internal PLL should be used Table 5 3 Transceiver clock CLKM connection PDO 26 CLKM 1MHz The REB has to be modified to deliver the CLKM signal to PDO Therefore the appropriate solder jumper OQ resistor has to be mounted Designators of the 00 resistor are different for REB variants a
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