M16C/5M A/D Converter Using Repeat Sweep Mode 0
Contents
1. The input pins of CMOS products are generally in the high impedance state In operation with an unused pin in the open circuit state extra electromagnetic noise is induced in the vicinity of LSI an associated shoot through current flows internally and malfunctions occur due to the false recognition of the pin state as an input signal become possible Unused pins should be handled as described under Handling of Unused Pins in the manual 2 Processing at Power on The state of the product is undefined at the moment when power is supplied The states of internal circuits in the LSI are indeterminate and the states of register settings and pins are undefined at the moment when power is supplied In a finished product where the reset signal is applied to the external reset pin the states of pins are not guaranteed from the moment when power is supplied until the reset process is completed In a similar way the states of pins in a product that is reset by an on chip power on reset function are not guaranteed from the moment when power is supplied until the power reaches the level at which resetting has been specified 3 Prohibition of Access to Reserved Addresses Access to reserved addresses is prohibited The reserved addresses are provided for the possible future expansion of functions Do not access these addresses the correct operation of LSI is not guaranteed if they are accessed 4 Clock Signals After applying a reset only2. 3 When A D conversion for all selected analog input pins is completed A D conversion is started again from the ANO pin The IR bit in the ADIC register does not become 1 interrupt requested 4 A D conversion does not stop until the ADST bit in the ADCONDO register is set to 0 A D conversion stop by a program Figure 3 1 shows Operation Timing in Repeat Sweep Mode 0 1 Start A D conversion convert input voltage of ANO 2 After completing A D conversion of ANO start A D conversion of AN1 3 After completing A D conversion of selected analog input pin start A D conversion again from ANO 4 Stop A D Conversion time Conversion time Conversion time _ conversion Setto 1 by a program Set to 0 by a program 1 ADST bit 0 Conversion result ADO register value of ANO AD1 register value of AN1 value of ANi ADi register A A D conversion Undefined x Conversion result X Undefined Figure 3 1 Operation Timing in Repeat Sweep Mode 0 RO1AN0144EJ0100 Rev 1 00 ztENESAS Page 2 of 7 Mar 15 2011 M16C 5M Group A D Converter Using Repeat Sweep Mode 0 4 A D Conversion Time This section describes how to calculate A D conversion time 4 1 A D Conversion Cycle Table 4 1 shows Cycles of A D Conversion Item A D conversion time is described below Start processing time depends on which AD is selected A D conversion starts after the start processing time elapses by
3. a Set the ADCON2 register Set the ADCONO register Set the ADCON1 register Wait for one or more cycles of AD Start A D conversion Figure 5 1 Set a pin to be used for analog input to input mode Select A D converter functions b2 b1 Select A D input group b4 Select an operation clock frequency Select A D converter functions b4 b3 Set to 11b when using repeat sweep mode 0 b5 Select an A D conversion start trigger b6 A D conversion start flag b7 Select an operation clock frequency Select A D converter functions b1 b0 Select A D sweep pins b2 Set to 0 when using repeat sweep mode 0 b4 Select an operation clock frequency b5 Set to 1 when enabling A D conversion Wait time until the A D converter is ready for a conversion when setting the ADSTBY bit from 0 to 1 Generate the A D conversion start trigger Setting Procedure When Using Repeat Sweep Mode 0 RO1AN0144EJ0100 Rev 1 00 Mar 15 2011 ztENESAS Page 4 of 7 M16C 5M Group A D Converter Using Repeat Sweep Mode 0 6 Sample Code A sample code can be downloaded from the Renesas Electronics website To download click Application Notes in the left hand side menu of the M16C Family page 6 1 Sample Code Operation In repeat sweep mode 0 functions listed in Table 6 1 can be selected The settings used in the sample code are marked with v in the table The sample code operation is as foll
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5. release the reset line after the operating clock signal has become stable When switching the clock signal during program execution wait until the target clock signal has stabilized When the clock signal is generated with an external resonator or from an external oscillator during a reset ensure that the reset line is only released after full stabilization of the clock signal Moreover when switching to a clock signal produced with an external resonator or by an external oscillator while program execution is in progress wait until the target clock signal is stable 5 Differences between Products Before changing from one product to another i e to one with a different part number confirm that the change will not lead to problems The characteristics of MPU MCU in the same group but having different part numbers may differ because of the differences in internal memory capacity and layout pattern When changing to products of different part numbers implement a system evaluation test for each of the products Notice 1 All information included in this document is current as of the date this document is issued Such information however is subject to change without any prior notice Before purchasing or using any Renesas Electronics products listed herein please confirm the latest product information with a Renesas Electronics sales office Also please pay regular and careful attention to additional and different inf
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8. RENESAS APPLICATION NOTE M16C 5M Group A D Converter RO1AN0144EJ0100 i Rev 1 00 Using Repeat Sweep Mode 0 eee oon 1 Abstract This document describes the setting procedure to use the A D converter in repeat sweep mode 0 2 Introduction The application example described in this document applies to the following microcomputer MCU e MCU M16C 5M Group This application note can be used with other M16C Family MCUs which have the same special function registers SFRs as the above group Check the manual for any modifications to functions Careful evaluation is recommended before using the sample code described in this application note RO1AN0144EJ0100 Rev 1 00 7tENESAS Page 1 of 7 Mar 15 2011 M16C 5M Group A D Converter Using Repeat Sweep Mode 0 3 Operation in Repeat Sweep Mode 0 This section describes operation when using the A D converter in repeat sweep mode 0 with a software trigger 1 When the ADST bit in the ADCONO register is set to 1 A D conversion start A D conversion starts The input voltage of the ANO pin is converted 2 After completing A D conversion of the ANO pin the value in the successive conversion register conversion result is transferred to the ADO register A D conversions for selected analog input pins are continuously performed in order Every time A D conversion for a pin is completed the conversion result is transferred to the ADi i 0 to 7 register corresponding to the pin
9. gument None Variable None Returned value None Function Declaration Set the A D converter to repeat sweep mode 0 and set the functions as marked in Table 6 1 Set an analog input pin to ANO P10 to input mode Generate a software trigger and start A D conversion of the voltage input at pins ANO to AN7 unsigned short read_ad_register unsigned char ch Outline Read A D register Argument unsigned char ch Select the A D register to be read Variable None Returned value unsigned short read_ad_data Value read from the A D register Function Read the A D register selected with the unsigned char ch argument Then return the read value as a returned value Other Function Tables Declaration void mcu_init void Outline CPU initialization Argument None Variable None Returned value None Function Declaration Set to single chip mode Switch the CPU clock from 125 kHz on chip oscillator mode divided by 8 to 125 kHz on chip oscillator mode divided by 1 void highspeed_from_foco125k void Outline Transition from 125 kHz on chip oscillator mode to high speed mode Argument None Variable None Returned value None Function Switch the CPU clock from 125 kHz on chip oscillator mode f OCO S divided by 1 to high speed mode RO1AN0144EJ0100 Rev 1 00 Mar 15 2011 RENESAS Page 6 of 7 M16C 5M Group A D Conve
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12. ows set the CPU clock as the main clock with no division by executing functions for CPU initialization transition from 125 kHz on chip oscillator mode to high speed mode then execute the function for A D conversion in repeat sweep mode 0 Refer to 6 2 Function Tables for details on functions Table 6 1 Sample Code Settings Functions Settings Operating clock AD f1 f1 divided by 2 f1 divided by 3 f1 divided by 4 f1 divided by 6 f1 divided by 12 fOCO40M divided by 2 fOCO40M divided by 3 fOCO40M divided by 4 fOCO40M divided by 6 fOCO40M divided by 12 A D conversion start conditions Software trigger Trigger by ADTRG Analog input group 1 ANO to AN7 ANO_0 to ANO_7 AN2_0 to AN2_7 AN3_0 to AN3_ 2 A D sweep pin 1 ANO to AN1 2 pins ANO to AN3 4 pins ANO to AN5 6 pins ANO to AN7 8 pins A D open circuit detection assist function Note Not used 1 The number of usable analog input pins varies depending on pin numbers of the package used Refer to the A D Converter in the User s Manual Hardware for details RO1AN0144EJ0100 Rev 1 00 Mar 15 2011 RENESAS Page 5 of 7 M16C 5M Group A D Converter Using Repeat Sweep Mode 0 6 2 Function Tables Function Tables for This Document Declaration void ad_repeatsweepO void Outline A D conversion in repeat sweep mode 0 Ar
13. rter Using Repeat Sweep Mode 0 7 Reference Documents MI16C 5M Group User s Manual Hardware Rev 1 01 The latest version can be downloaded from the Renesas Electronics website Technical Update Technical News The latest information can be downloaded from the Renesas Electronics website MI6C Series R8C Family C Compiler Package V 5 45 C Compiler User s Manual Rev 3 00 The latest version can be downloaded from the Renesas Electronics website Website and Support Renesas Electronics website http www renesas com Inquiries http www renesas com inquiry RO1AN0144EJ0100 Rev 1 00 7tENESAS Page 7 of 7 Mar 15 2011 M16C 5M Group Using Repeat Sweep Mode 0 Revision History Description Rev Date Summary 1 00 2011 03 15 First edition issued All trademarks and registered trademarks are the property of their respective owners A 1 General Precautions in the Handling of MPU MCU Products The following usage notes are applicable to all MPU MCU products from Renesas For detailed usage notes on the products covered by this manual refer to the relevant sections of the manual If the descriptions under General Precautions in the Handling of MPU MCU Products and in the body of the manual differ from each other the description in the body of the manual takes precedence 1 Handling of Unused Pins Handle unused pins in accord with the directions given under Handling of Unused Pins in the manual
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15. setting the ADST bit in the ADCONDO register to 1 A D conversion start When reading the ADST bit before starting A D conversion 0 A D conversion stop is read In repeat sweep mode 0 inter execution processing time is inserted between A D conversions Repeat sweep mode 0 Start processing time A D conversion execution time inter execution processing time A D conversion execution time inter execution processing time Table 4 1 Cycles of A D Conversion Item A D Conversion Item Number of Cycles 1 to 2 cycles of fAD sane AID conversion execution ime 4 2 A D Operation Clock Frequencies Table 4 2 lists the A D Operation Clock Frequencies Table 4 2 A D Operation Clock Frequencies 1 Voc AVcc Vrer 3 0 to 5 5 V Vss AVgg 0 V at Topr 40 C to 85 C for J version 40 C to 125 C for K version unless otherwise specified Standard Typ Max Parameter Measuring Condition 4 0 V lt Vec lt 5 5V A D operating clock frequency 3 2 V lt Vcc lt 4 0 V 3 0 V lt Vec lt 3 2 V Note 1 Use when AVcc Vec R01AN0144EJ0100 Rev 1 00 ztENESAS Page 3 of 7 Mar 15 2011 M16C 5M Group A D Converter Using Repeat Sweep Mode 0 5 Settings Figure 5 1 shows the Setting Procedure When Using Repeat Sweep Mode 0 Refer to the User s Manual Hardware for details on registers Setting for repeat sweep mode 0 Set an analog input pin
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