Philips Semiconductors

Errata

P87C51MB2/P87C51MC2

Errata sheet

1

2001 Apr 06

Version 1.0

FUNCTIONAL DEVIATIONS

Deviation #1

RxD1 pin is an open drain configuration.

Work-around:

A resistor must be used if this pin is to be used as an output. These pins will become port 4 on the next

release fixing this issue.

Deviation #2

Port 4 does not exist for the RxD1 and TxD1 pins. DC parameters differ from standard port pins.

Work-around:

None. These pins will become port 4 on the next release.

Deviation #3

RxD1, TxD1, and ALE pins will not go into once mode.

Work-around:

None. This will be fixed on the next release.

Deviation #4

In the UART, the contents of RB8 and SBUF change when they shouldn’t if SM2=1 in modes 2 and 3.

Work-around:

None. Will be fixed on the next release.

Deviation #5

The UART double buffering will be implemented on the next release.

Work-around:

None.

Deviation #6

SPI block will be implemented on the next release.

Work-around:

None.

Deviation #7

Security bits are not 100% compatible with past 80c51 products.

Work-around:

The security bits will be compatible on the next release.