Active T89C5115 Errata List

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Timer 2 (Baud Rate Generator Mode) – Long Start Time

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UART – RB8 Lost with JBC on SCON Register

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ADC- Interrupt During Idle Conversion

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Flash/EEPROM – First Read After Load Disturbed

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C51 Core – Bad Exit of Power-down in X2 Mode

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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