AT  -  系列元器件数据手册
TS80C251G2D-ES  -  Errata Sheet,8051 Microcontrollers  -  Atmel  -  8051

Active Errata List
• Power-down Mode Current Out of Specification in ROMless Mode
• Power-fail Threshold Out of Specification
• TWI Data Transmission in Slave Transmitter Mode

Errata Description
1. Power-down Mode Current Out of Specification in ROMless Mode IPD is out of specification when EA pin is tied to a low level. The ROMless products and EPROM and ROM products used as ROMless (EA = 0) are consuming extra current in power-down mode. Table 1 below shows the power-down current maximum value and specification for high speed in low voltage versions.
2. Power-fail Threshold Out of Specification
The tolerance on the power-fail reset voltage threshold is out of specification. The device may never exit reset at power-up when power-fail reset is enabled.
Workaround Some devices may need a higher voltage to exit reset. The RSTD bit has to be set in POWM register to disable the Power-fail Reset detector before the voltage is reduced.
3. Two-wire Interface Data Transmission in Slave Transmitter Mode When in slave transmitter mode, if the slave transmits data starting with a low level on the bus (MSB is logic 0), data set-up time is not respected and leads to a bus error.