Rev. 4162B805106/02
Active Errata List
UART/Reception in Modes 1, 2 and 3/UART False Start Bits Detection
During UART Reception, Clearing REN May Generate Unexpected IT
Timer 2/Downcounter Mode/Double IT with Slow External Clock
JBC/Double IT when External Interrupt Occurs During JBC Instruction
On Start-up the Microncontroller Goes Into Test Mode
Errata History
Errata Description
1.
UART/Reception in Modes 1, 2 and 3/UART False Start Bits Detection
When a false start bit occurs on the UART, some UART internal signals are not
reset. Then when a real start bit occurs, the sampling is shifted.
Workaround
None.
2.
During UART Reception, Clearing REN May Generate Unexpected IT
During UART reception, if the REN bit is cleared between a start bit detection and
the end of reception, the UART will not discard the data (RI is set).
Workaround
Test REN at the beginning of the Interrupt routine just after CLR RI, and run the
Interrupt routine code only if REN is set.
3.
Timer 2/Countdown Mode/Double IT with Slow External Clock
Double IT with slow external clock in countdown mode. Timer 2 in 16-bit auto-
reload in countdown mode with external clock input 2 interrupts are generated
successively with low frequency on clock input (typ 10 - 40 kHz).
Workaround
Caution: Will not work if initially RCAP = 0x0000
Reload FFFE into TH2 - TL2 in ISR and countdown to RCAP-1 (to recover cycle
lost in ISR).
4.
JBC/Double IT when External Interrupt Occurs During JBC Instruction
On polling algorithm in ISR on IE1 or IE0 bit, when external IT appears during JBC
instruction, flag is not cleared and next JBC sees another IT, then the same IT is
seen twice.
Workaround
Use JB Instruction instead of JBC instruction to test bit and CLR instruction to
clear it.
Lot Number
Errata List
Z41648 and below
1, 2, 3, 4, 5
Z41648 and above
1, 2, 3, 4
8051
Microcontrollers
T87C5101
T83C5101
T83C5102
Errata Sheet
2
T8xC5101/02 Errata Sheet
4162B805106/02
5.
On Start-up the Microcontroller Goes Into Test Mode
Under specific conditions (power lead edge, temperature and P3 value) on start-up T8xC5101/02 devices do not exe-
cute the user code. It goes into test mode and stays there.
Workaround
1.
P3 = 0x00
2.
Send another reset pulse a few machine cycles after the falling edge of the first reset pulse.
Printed on recycled paper.
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