The PIC16F871/870 Rev. A1 parts you have received conform functionally to the Device Data Sheet (DS30569 A), except for the anomalies described below. All the problems listed here will be addressed in future revisions of the PIC16F871/870 silicon. PIC16F870/871 PIC16F870/871 Rev. A1 Silicon Errata Sheet The PIC16F871/870 Rev. A1 parts you have received 3. Module: Timer1 conform functionally to the Device Data Sheet (DS30569A), except for the anomalies described When Timer1 is running in Asynchronous mode below. and then disabled, data in the Timer1 register (TMR1) may become corrupted. Corruption occurs All the problems listed here will be addressed in future when the timer enable is turned off at the same revisions of the PIC16F871/870 silicon. ……