CSB1000JA datasheet(94/153 Pages) STMICROELECTRONICS

94 / 153 page

ST72334J/N, ST72314J/N, ST72124J

94/153

SERIAL COMMUNICATIONS INTERFACE (Cont’d)

CONTROL REGISTER 1 (CR1)

Read/Write

Reset Value: Undefined

Bit 7 = R8

Receive data bit 8.

This bit is used to store the 9th bit of the received

word when M=1.

Bit 6 = T8

Transmit data bit 8.

This bit is used to store the 9th bit of the transmit-

ted word when M=1.

Bit 4 = M

Word length.

This bit determines the word length. It is set or

cleared by software.

0: 1 Start bit, 8 Data bits, 1 Stop bit

1: 1 Start bit, 9 Data bits, 1 Stop bit

Bit 3 = WAKE

Wake-Up method.

This bit determines the SCI Wake-Up method, it is

set or cleared by software.

0: Idle Line

1: Address Mark

CONTROL REGISTER 2 (CR2)

Read/Write

Reset Value: 0000 0000 (00 h)

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 SR 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 SR 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 SR 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 SR register.

Bit 3 = TE

Transmitter enable.

This bit enables the transmitter and assigns the

TDO pin to the alternate function. It is set and

cleared by software.

0: Transmitter is disabled, the TDO pin is back to

the I/O port configuration.

1: Transmitter is enabled

Note: during transmission, a “0” pulse on the TE

bit (“0” followed by “1”) sends a preamble after the

current word.

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

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.

WAKE

TIE

TCIE

RIE

ILIE

RWU

SBK

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