ST72361 datasheet(124/224 Pages) STMICROELECTRONICS

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ST72361

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LINSCI

™ SERIAL COMMUNICATION INTERFACE (SCI Mode) (Cont’d)

10.7.5 SCI Mode - Functional Description

Conventional Baud Rate Generator Mode

The block diagram of the Serial Control Interface

in conventional baud rate generator mode is

shown in Figure 1.

It uses four registers:

– 2 control registers (SCICR1 and SCICR2)

– A status register (SCISR)

– A baud rate register (SCIBRR)

Extended Prescaler Mode

Two additional prescalers are available in extend-

ed prescaler mode. They are shown in Figure 3.

– An extended prescaler receiver register (SCIER-

PR)

– An extended prescaler transmitter register (SCI-

ETPR)

10.7.5.1 Serial Data Format

Word length may be selected as being either 8 or 9

bits by programming the M bit in the SCICR1 reg-

ister (see Figure 2).

The TDO pin is in low state during the start bit.

The TDO pin is in high state during the stop bit.

An Idle character is interpreted as a continuous

logic high level for 10 (or 11) full bit times.

A Break character is a character with a sufficient

number of low level bits to break the normal data

format followed by an extra “1” bit to acknowledge

the start bit.

Figure 78. Word Length Programming

Bit0

Bit1

Bit2

Bit3

Bit4

Bit5

Bit6

Bit7

Bit8

Start

Bit

Stop

Bit

Start

Bit

Idle Line

Bit0

Bit1

Bit2

Bit3

Bit4

Bit5

Bit6

Bit7

Start

Bit

Stop

Bit

Start

Bit

Start

Bit

Idle Line

Start

Bit

9-bit Word length (M bit is set)

8-bit Word length (M bit is reset)

Possible

Parity

Bit

Possible

Parity

Bit

Break Character

Start

Bit

Extra

’1’

Data Character

Break Character

Start

Bit

Extra

’1’

Data Character

Next Data Character

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