Errata Sheet
Contents
1. Workaround 1 The behavior can be avoided if a message object is not updated by software when a transmission of the corresponding message object is pending TXRQ element is set and the CAN module is active INIT 0 If a re transmission of a message e g after lost arbitration or after the occurrence of an error frame needs to be cancelled the TXRQ element should be cleared by software as soon as NEWDAT is reset from the CAN module Errata Sheet C505A 4R C505CA 4R Step ES BA BA Release 1 5 WSM 20f7 2 The nodes in the CAN system ignore the remote frame with the identifier 0 and no data frame is triggered by this remote frame CAN 3 Description in User s Manual regarding the reception of remote frames and the data length code DLC field is incorrect C505CA only It is inaccurately described in the User s Manual on page 6 78 under Arbitration Registers that When the CAN controller stores a remote frame only the data length code is stored into the corresponding message object The correct should be that the DLC field remains unchanged in the receiving message object and that the CPU has the responsibility to define the DLC of the answering data frame This correction will be updated to the future versions of the User s Manuals Workaround Not applicable CAN 4 Flowchart sequence in figure in User s Manual regarding Micro controller handling of the Last Message Object is partly incorrect C505CA only F2. Infineon technologies Microcontrollers Errata Sheet 10 July 2000 Release 1 5 Device C505A 4RM C505CA 4RM Stepping Code Marking ES BA BA Package P MQFP 44 This Errata Sheet describes the deviations from the current user documentation The classification and numbering system is module oriented in a continual ascending sequence over several derivatives as well already solved deviations are included So gaps inside this enumeration could occur The current documentation is C505 C User s Manual 08 97 C505A C505CA Addendum to C505 C User s Manual 09 97 C505 A C505C A Data Sheet 06 00 Instruction Set Manual 05 98 Note Devices marked with EES or ES are engineering samples which may not be completely tested in all functional and electrical characteristics therefore they should be used for evaluation only The specific test conditions for EES and ES are documented in a separate Status Sheet Change summary to last Errata Sheet Rel 1 4 e Added new items numbered CAN 3 CAN 4 CAN 5 Errata Sheet C505A 4R C505CA 4R Step ES BA BA Release 1 5 WSM 1o0f7 Functional Problems CAN 2 Unexpected Remote Frame Transmission C505CA only The on chip CAN module may send an unexpected remote frame with the identifier 0 when a pending transmit request of a message object is disabled by software There are three possibilities to disable a pending transmit request of a message object n 1 14 e Set CPUUPDn e
3. can be used to exit the idle mode before the WDT reaches the counter state 7FFCh This can be achieved by using Timer 0 1 or 2 This timer can be programmed to generate an interrupt at a WDT counter state prior to overflow for e g at 7FOOh Prior to entering idle mode the WDT can be refreshed and the timer 0 1or 2 can be started immediately to synchronize the WDT In the interrupt service routine of the Timer 0 1 or 2 the WDT must be refreshed If required idle mode could be entered again Errata Sheet C505A 4R C505CA 4R Step ES BA BA Release 1 5 WSM 40f7 SWPD 1 Triggering of Software Power Down SWPD wake up immediately after SWPD entry via external interrupt on a frequent basis is not recommended When the micro controller is running at frequencies lower than 10MHz and the external wake up from SWPD occurs very soon e g lt 200ms after entering this mode and this happens on a regular basis the internal clock may still be valid when the wake up trigger occurs In this rare case the micro controller may get confused with its state and program execution becomes unpredictable Workaround In applications running at 10MHz or below that enters and exits the SWPD mode on a frequent basis it is recommended to enter Slow Down mode before Power Down mode entry On SWPD wake up the first instruction in the interrupt routine at 07bH should disable Slow Down mode This method would only cause an insignificant delay in the range o
4. f ws and would ensure specified behavior of the micro controller Note that when Slow Down mode has been entered there is no longer a minimum time requirement before SWPD external wake up is triggered Deviation from Electrical and Timing Specification DC 1 Maximum limit of logical 0 to 1 transition current lq max is higher The maximum for the logical 0 to 1 transition current at the ports does not meet the specified value tL max is 1 05 mA instead of 0 65 mA Application Hint If an application is intended to be transferred from C505 C L C505 C 2R or C505 C A 4E to C505 C A 4R step ES BA special attention should be paid to the deviation of the k value The limits the maximum resistance of the external path when the pin is externally pulled low Therefore this should be taken into account when designing and evaluating applications where the C505 C A 4R is intended to replace the derivatives mentioned above Errata Sheet C505A 4R C505CA 4R Step ES BA BA Release 1 5 WSM 5 of7 DC 3 Minimum power supply voltage Vcc min is higher when exiting IDLE mode via external reset The operating voltage of the device is 4 85V 5 5V Voc min is 4 85V instead of 4 25V When operating the device below 4 85V leaving IDLE mode via an external reset on the device may result in erroneous reset state In such cases the high byte of program counter may not be reset to 00h correctly Provided that IDLE mode is not exited
5. lement e Reset TXRQn element e Reset MSGVALn element Either of these actions will prevent further transmissions of message object n The symptom described above occurs when the CPU accesses CPUUPD TXRQ or MSGVAL while the pending transmit request of the corresponding message object is transferred to the CAN state machine just before start of frame transmission At this particular time the transmit request is transferred to the CAN state machine before the CPU prevents transmission In this case the transmit request is still accepted from the CAN state machine However the transfer of the identifier the data length code and the data of the corresponding message object is prevented Then the pre charge values of the internal hidden buffer are transmitted instead this causes a remote frame transmission with identifier 0 11 bit and data length code 0 This behavior occurs only when the transmit request of message object n is pending and the transmit requests of other message objects are not active single transmit request If this remote frame loses arbitration to a data frame with identifier 0 or if it is disturbed by an error frame it is not retransmitted Effects to other CAN nodes in the network The effect leads to delays of other pending messages in the CAN network due to the high priority of the Remote Frame Furthermore the unexpected remote frame can trigger other data frames depending on the CAN node s configuration
6. mit of logic O input current min is lower Application Support Group Singapore Errata Sheet C505A 4R C505CA 4R Step ES BA BA Release 1 5 WSM 7 0of7
7. or the software flowchart figure 6 37 in User s Manual 08 97 the correct would be to first process message contents and then to clear bit NEWDAT process message contents NEWDAT 0 l This correction will be updated to the future versions of the User s Manuals Workaround Not applicable Errata Sheet C505A 4R C505CA 4R Step ES BA BA Release 1 5 WSM 30f7 CAN 5 Description in User s Manual section 6 4 5 regarding the Configuration of the Bit Timing is partly incorrect C505CA only As described for the CAN Bit Timing Register High BTR1 the minimum total time requirement for segment 1 and segment 2 is as follows ttsegi 2 3x ta tTseg2 2 2 X tg The total bit time remains at ttseg1 tTseg2 2 7 X t This correction will be updated to the future versions of the User s Manuals Workaround Not applicable WDT 1 Watchdog Timer is not halted in idle mode The Watchdog Timer WDT is not halted in the idle mode as defined However during the idle mode an overflow condition of the WDT does not initiate an internal reset In such a case the WDT starts a new count sequence Workaround 1 Do not use the WDT function in combination with the idle mode 2 In case of WDT is running before entry into idle mode to avoid a WDT initiated reset upon exit of the idle mode the following methods can be used A The WDT is refreshed immediately upon exit from idle mode B A timed interrupt
8. via an external reset on the device the device is fully functional with power supply in the specified range of Vcc 4 25V 5 5V DC 4 Minimum limit of logic 0 input current l min is lower The minimum for the logic 0 input current at the ports is lower than the specified values l min is 7 uA instead of 10 uA Errata Sheet C505A 4R C505CA 4R Step ES BA BA Release 1 5 WSM 60f7 History List since last CPU Step ES AA Functional Problems Functional Short Description Fixed Problem CAN 2 Unexpected Remote Frame Transmission C505CA onl a CAN 3 Description in User s Manual regarding the reception of remote frames and the data length code DLC field is incorrect C505CA only Flowchart sequence in figure in User s Manual regarding Micro controller i handling of the Last Message Object is partly incorrect C505CA only Description in User s Manual section 6 4 5 regarding the Configuration of the S Bit Timing is Watchdog Timer is not halted in idle mode Triggering of Software Power Down SWPD wake up immediately after i SWPD entry via external interrupt on a frequent basis is not recommended AC DC Deviations AC DC Short Description Fixed Deviation Maximum limit of logical 0 to 1 transition current Ir max is higher Minimum input high voltage Vi min on all pins except XTAL1 and RESET DC 3 Minimum power supply voltage Vcc min is higher when exiting IDLE mode via external reset Minimum li
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