HC705C9AGRSSLASHD datasheet(93/157 Pages) NXP

93 / 157 page

General Release Specification

SCI I/O Registers

MC68HC705C9A — Rev. 2.0

Serial Communications Interface (SCI)

ILIE — Idle Line Interrupt Enable

This read/write bit enables SCI interrupt requests when the IDLE bit

becomes set. Resets clear the ILIE bit.

1 = IDLE interrupt requests enabled

0 = IDLE interrupt requests disabled

TE — Transmitter Enable

Setting this read/write bit begins the transmission by sending a

preamble of 10 or 11 logic ones from the transmit shift register to the

PD1/TDO pin. Resets clear the TE bit.

1 = Transmission enabled

0 = Transmission disabled

RE — Receiver Enable

Setting this read/write bit enables the receiver. Clearing the RE bit

disables the receiver and receiver interrupts but does not affect the

receiver interrupt flags. Resets clear the RE bit.

1 = Receiver enabled

0 = Receiver disabled

RWU — Receiver Wakeup Enable

This read/write bit puts the receiver in a standby state. Typically, data

transmitted to the receiver clears the RWU bit and returns the receiver

to normal operation. The WAKE bit in SCCR1 determines whether an

idle input or an address mark brings the receiver out of standby state.

Reset clears the RWU bit.

1 = Standby state

0 = Normal operation

SBK — Send Break

Setting this read/write bit continuously transmits break codes in the

form of 10-bit or 11-bit groups of logic zeros. Clearing the SBK bit

stops the break codes and transmits a logic one as a start bit. Reset

clears the SBK bit.

1 = Break codes being transmitted

0 = No break codes being transmitted

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705C9AGRS/D Datasheet(PDF) 93 Page - NXP Semiconductors