C167CS datasheet(274/517 Pages) INFINEON

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C167CS

Derivatives

The Asynchronous/Synchronous Serial Interface

User’s Manual

11-8

V2.0, 2000-07

11.2

Synchronous Operation

Synchronous mode supports half-duplex communication, basically for simple IO

expansion via shift registers. Data is transmitted and received via pin RXD0, while pin

TXD0 outputs the shift clock. These signals are alternate port functions. Synchronous

mode is selected with S0M = ‘000B’.

8 data bits are transmitted or received synchronous to a shift clock generated by the

internal baud rate generator. The shift clock is only active as long as data bits are

transmitted or received.

Figure 11-5

Synchronous Mode of Serial Channel ASC0

MCB02220

Reload Register

Baud Rate Timer

Receive Int.

Request

MUX

÷ 2

Clock

Serial Port Control

Shift Clock

Receive Shift

Receive Buffer Reg.

TXD0/P3.10

Internal Bus

Transmit Int.

Request

Error Int.

Request

S0OE

S0M = 000B

S0REN

S0OEN

S0LB

÷ 4

RXD0/P3.11

Receive

Transmit

CPU

S0R

S0RIR

S0TIR

S0EIR

Transmit Shift

Transmit Buffer Reg.

S0TBUF

S0RBUF

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