ST7FMC1M2T3 查看數據表（PDF） - STMicroelectronics

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ST7FMC1M2T3

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

LINSCI™ SERIAL COMMUNICATION INTERFACE (SCI Mode) (cont’d)

10.5.5 SCI Mode - Functional Description

10.5.5.1 Serial Data Format

Conventional Baud Rate Generator Mode

The block diagram of the Serial Control Interface

in conventional baud rate generator mode is

shown in Figure 62.

Word length may be selected as being either 8 or 9

bits by programming the M bit in the SCICR1 reg-

ister (see Figure 63).

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

It uses four registers:

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

– 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 64.

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.

– An extended prescaler receiver register (SCIER-

PR)

– An extended prescaler transmitter register (SCI-

ETPR)

Figure 63. Word Length Programming

9-bit Word length (M bit is set)

Data Character

Possible

Parity

Bit

Next Data Character

Next

Start

Bit Bit0

Bit1

Bit2

Bit3

Bit4 Bit5

Bit6

Bit7 Bit8

Stop

Bit

Start

Bit

Start

Idle Line

Bit

Break Character

Extra Start

’1’ Bit

8-bit Word length (M bit is reset)

Data Character

Start

Bit Bit0 Bit1 Bit2 Bit3 Bit4 Bit5

Possible

Parity

Bit

Bit6

Bit7

Stop

Bit

Next Data Character

Next

Start

Bit

Idle Line

Start

Bit

Break Character

Extra

’1’

Start

Bit

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