ST72324BLK4 datasheet(96/151 Pages) STMICROELECTRONICS

Part #	ST72324BLK4

Description	3V RANGE 8-BIT MCU WITH 8 TO 32K FLASH/ROM, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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ST72F324L, ST72324BL

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SERIAL COMMUNICATIONS 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.

Caution: The TDO pin is free for general purpose

I/O only when the TE and RE bits are both cleared

(or if TE is never set).

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

Note: Before selecting Mute mode (setting the

RWU bit), the SCI must receive some data first,

otherwise it cannot function in Mute mode with

wakeup by idle line detection.

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 will send a BREAK word at the end of

the current word.

70

TIE

TCIE

RIE

ILIE

TE

RE

RWU

SBK

1

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