High-Performance SAB 80C517A/83C517A-5 8-Bit CMOS Single ...

SAB 80C517A/83C517A-5Serial Interface 1Serial interface 1 can operate in two asynchronous modes:Mode A:Mode B:9-bit UART, variable baud rate.11 bits are transmitted (through T × D1) or received (through R × D1):a start bit (0), 8 data bits (LSB first), a programmable 9th, and a stop bit (1).On transmission, the 9th data bit (TB81 in S1CON) can be assigned to thevalue of 0 or 1. For example, the parity bit (P in the PSW) could be movedinto TB81 or a second stop bit by setting TB81 to 1. On reception the 9thdata bit goes into RB81 in special function register S1CON, while the stopbit is ignored.8-bit UART, variable baud rate.10 bits are transmitted (through T × D1) or received (through R × D1):a start bit (0), 8 data bits (LSB first), and a stop bit (1). On reception, thestop bit goes into RB81 in special function register S1CON.Variable Baud Rates for Serial Interface 1.Variable baud rates for modes A and B of serial interface 1 are derived from a dedicated baudrate generator.baud rate clockThe baud rate clock (baud rate =16) is generated by an 10-bit free running timerwith programmable reload register.f OSCMode A, B baudrate =32 * (2 10 - SREL)Semiconductor Group 57