just check for your crystal | Microcontroller › 8051 › serial data transmission to pc with 89s51 › just check for your crystal February 25, 2014 at 5:37 pm #11111 Ashutosh BhattParticipant just check for your crystal frequency it should bot be 12 MHz it must be 11.059 MHz. only this crystal value will give you exact 9600 baud rate
