ST92196A datasheet(208/268 Pages) STMICROELECTRONICS

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- SERIAL COMMUNICATIONS INTERFACE (SCI)

SERIAL COMMUNICATIONS INTERFACE (Cont’d)

BAUD RATE GENERATOR HIGH REGISTER

(BRGHR)

R252 - Read/Write

Reset value: undefined

BAUD RATE GENERATOR LOW REGISTER

(BRGLR)

R253 - Read/Write

Reset value: undefined

Bit 15:0 =

Baud Rate Generator MSB and LSB.

The Baud Rate generator is a programmable di-

vide by “N” counter which can be used to generate

the clocks for the transmitter and/or receiver. This

counter divides the clock input by the value in the

Baud Rate Generator Register. The minimum

baud rate divisor is 2 and the maximum divisor is

216-1. After initialization of the baud rate genera-

tor, the divisor value is immediately loaded into the

counter. This prevents potentially long random

counts on the initial load. If set to 0 or 1, the Baud

Rate Generator is stopped.

INPUT CONTROL (SICR)

R254 - Read/Write

Reset value: 0000 0011 (03h)

Bit 7 = Reserved.

Bit 6 = INPL:

SIN Input Polarity.

0: Polarity not inverted.

1: Polarity inverted.

Note: INPL only affects received data. In Auto-

Echo mode SOUT = SIN even if INPL is set. In

Loop-Back mode the state of the INPL bit is irrele-

vant.

Bit 5:3 = Reserved.

Bit 2 = INPEN:

Input Disable.

0: Enable SIN input

1: Disable SIN input

Bit 1:0 = Reserved.

OUTPUT CONTROL (SOCR)

R255 - Read/Write

Reset value: 0000 0001 (01h)

Bit 7 = OUTPL:

SOUT Output Polarity.

0: Polarity not inverted.

1: Polarity inverted.

Note: OUTPL only affects the data sent by the

transmitter section. In Auto-Echo mode SOUT =

SIN even if OUTPL=1. In Loop-Back mode, the

state of OUTPL is irrelevant.

Bit 6 = OUTSB:

SOUT Output Stand-By Level.

0: SOUT stand-by level is HIGH.

1: SOUT stand-by level is LOW.

Bit 5:0 = Reserved.

BG15

BG14

BG13

BG12

BG11

BG10

BG9

BG8

BG7

BG6

BG5

BG4

BG3

BG2

BG1

BG0

INPL

INPEN

OUTPL

OUTSB

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