Siemens EF 88H Series Bedienungsanleitung PDF herunterladen (Seite 118)

Device Specification

Semiconductor Group 7-56

Serial Interface 1

Serial interface 1 can operate in two asynchronous modes:

Mode A: 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 the

value of 0 or 1. For example, the parity bit (P in the PSW) could be moved

into TB81 or a second stop bit by setting TB81 to 1. On reception the 9th

data bit goes into RB81 in special function register S1CON, while the stop

bit is ignored.

Mode B: 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, the

stop 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 baud

rate generator.

The baud rate clock (baud rate = ) is generated by an 10-bit free running timer

with programmable reload register.

Mode A, B baudrate =

rate c

OSC

- SREL)

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Siemens EF 88H Series Bedienungsanleitung Seite 118