ST72344 datasheet(111/191 Pages) STMICROELECTRONICS

111 / 191 page

ST72340, ST72344, ST72345

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SCI SERIAL COMMUNICATION INTERFACE (Cont’d)

CONTROL REGISTER 2 (SCICR2)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7 = TIE Transmitter interrupt enable.

This bit is set and cleared by software.

0: Interrupt is inhibited

1: An SCI interrupt is generated whenever

TDRE = 1 in the SCISR register

Bit 6 = TCIE Transmission complete interrupt ena-

ble

This bit is set and cleared by software.

0: Interrupt is inhibited

1: An SCI interrupt is generated whenever TC = 1

in the SCISR register

Bit 5 = RIE Receiver interrupt enable.

This bit is set and cleared by software.

0: Interrupt is inhibited

1: An SCI interrupt is generated whenever OR = 1

or RDRF = 1 in the SCISR register

Bit 4 = ILIE Idle line interrupt enable.

This bit is set and cleared by software.

0: Interrupt is inhibited

1: An SCI interrupt is generated whenever

IDLE = 1 in the SCISR register.

Bit 3 = TE Transmitter enable.

This bit enables the transmitter. It is set and

cleared by software.

0: Transmitter is disabled

1: Transmitter is enabled

Notes:

– During transmission, a “0” pulse on the TE bit

(“0” followed by “1”) sends a preamble (idle line)

after the current word.

– When TE is set there is a 1 bit-time delay before

the transmission starts.

Bit 2 = RE Receiver enable.

This bit enables the receiver. It is set and cleared

by software.

0: Receiver is disabled

1: Receiver is enabled and begins searching for a

start bit

Bit 1 = RWU Receiver wake-up.

This bit determines if the SCI is in mute mode or

not. It is set and cleared by software and can be

cleared by hardware when a wake-up sequence is

recognized.

0: Receiver in active mode

1: Receiver in mute mode

Notes:

– Before selecting Mute mode (by setting the RWU

bit) the SCI must first receive a data byte, other-

wise it cannot function in Mute mode with wake-

up by Idle line detection.

– In Address Mark Detection Wake-Up configura-

tion (WAKE bit = 1) the RWU bit cannot be mod-

ified by software while the RDRF bit is set.

Bit 0 = SBK Send break.

This bit set is used to send break characters. It is

set and cleared by software.

0: No break character is transmitted

1: Break characters are transmitted

Note: If the SBK bit is set to “1” and then to “0”, the

transmitter sends a BREAK word at the end of the

current word.

TIE

TCIE

RIE

ILIE

RWU

SBK

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