active t89c5115 errata list ? timer 2 (baud rate generator mode) ? long start time ? uart ? rb8 lost with jbc on scon register ? adc- interrupt during idle conversion ? flash/eeprom ? first read after load disturbed ? c51 core ? bad exit of power-down in x2 mode ? timer0/1 ? extra interrupt ? timer1 - mode1 does not generate baud rate generator for uart t89c5115 errata history t89c5115 errata description 1. timer 2 (baud rate generator mode) ? long start time when timer 2 is used as baud rate generator, th2 is not loaded with racp2h at the beginning, then uart is not operational before almost 10,000 machine cycles. workaround add in software an initialization of th2 and tl2, with the value of rcap2h and rcap2l. 2. uart - rb8 lost with jbc on scon register when using the jbc instruction on any bit of scon register, if rb8 changes from 1 to 0, the 0 bit can be lost. workaround after each use clear rb8. 3. adc - interrupt controller/adc idle mode/loops in high priority interrupt the problem occurs during an a/d conversion in idle mode, if a hardware interrupt occurs followed by a second interrupt with higher priority before the end of the a/d conversion. if the above configuration occurs, the highest priority interrupt is served immediately after the a/d conversion. at the end of the highest priority interrupt service, the processor will not serve the hardware reset interrupt pend- ing. it will also not serve any new interrupt requests with a priority lower than the high level priority last served. workaround disable all interrupts (interrupt global enable bit) before starting an a/d conver- sion in idle mode, then re-enable all interrupts immediately after. 4. flash/eeprom ? first read after load disturbed in the "in-application programming" mode from the flash, if the user software application load the column latch area prior to call the programming sequence in the can bootloader. lot number errata list all lots 1, 2, 3, 4, 5, 6,7 80c51 mcus t89c5115 errata sheet
2 4177c?8051?05/06 t89c5115 errata sheet the "read after load" issue leads to a wrong opcode fetch during the column latch load sequence. workaround update of the flash api library. a nop instruction has to be inserted after the load instruction. movx @dptr,a ;load column latches nop ; added instruction 5. c51 core ? bad exit of power-down in x2 mode when exiting power-down mode by interrupt while cpu is in x2 mode, it leads to bad execution of the first instruction run when cpu restarts. workaround set the cpu in x1 mode directly before entering power-down mode. 6. timer0/1 ? extra interrupt when the timer0 is in x1 mode and timer1 in x2 mode and vice versa, extra interrupt may randomly occur for timer0 or timer1. workaround use the same mode for the two timers. 7. timer1 ? in mode 1 does not generate baud rate to uart. the timer1, when used as a baud rate generator in mode 1 (16 bits counter) for low baud rates, does not generate baud rate to uart. workaround no .
3 4177c?8051?05/06 t89c5115 errata sheet active uart bootloader errata list ? timer 2 and uart are not stopped ? watchdog and flash api starting the bootloader execution ? autobaud false start bit detection ? flash api ?__api_wr_code_page? with 0 data in length parameter field uart bootloader errata history uart bootloader errata description 1. timer 2 and uart are not stopped when the bootloader receives the command ?start application? (ljmp 0), the timer 2 and the uart are not stopped. workaround the application must have in its setup function a reset of timer 2 and uart. mov scon, #00h mov t2con, #00h mov rcap2l, #00h mov rcap2h, #00h mov tl2, #00h mov th2, #00h 2. watchdog and flash api starting the bootloader execution when an application call ?__api_start_bootloader? or ?__api_start_isp? routines while the watchdog is enabled, when the watchdog overflow it will restart the application instead of the bootloader workaround set bljb(=1) before calling the __api_start_bootloader or __api_start_isp if the watchdog is used. 3. autobaud false start bit detection uart autobaud sequence does not work on some special uarts. some laptops have the uart tx line set to 0 when unused (com port closed), this results in a false baud rate calcu- lation on the ?u? character. the autobaud sequence checks for a ?0? state (not a falling edge) on the rx line of the uart microcontroller to detect the ?start? bit of the ?u? synchro character. as this line is ?0? by default when com port is closed, the autobaud routine starts its baudrate calculation at the opening sequence of the uart. workaround a ?special sync? can be used with ?flip? software. in this case, the open port event and the ?u? sent are dissociated. the user must first open his com port with the ?con- nect? button, then reset its hardware and finally push the ?sync? button. version number errata list 1.0.0 1, 2, 3, 4
4 4177c?8051?05/06 t89c5115 errata sheet 4. flash api ?__api_wr_code_page? with 0 data in length parameter field when the flash api ?__api_wr_code_page? is called with the field nb_data equal 0 then 255 data are wrote in flash. workaround include a test on nb_data before executed __api_wr_code_page routine.
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