MC68HC705C9ACFN datasheet(92/157 Pages) FREESCALE

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General Release Speciﬁcation

SCI I/O Registers

MC68HC705C9A — Rev. 2.0

Serial Communications Interface (SCI)

9.14.3 SCI Control Register 2 (SCCR2)

SCI control register 2, shown in Figure 9-10, has these functions:

•

Enables the SCI receiver and SCI receiver interrupts

•

Enables the SCI transmitter and SCI transmitter interrupts

•

Enables SCI receiver idle interrupts

•

Enables SCI transmission complete interrupts

•

Enables SCI wakeup

•

Transmits SCI break characters

TIE — Transmit Interrupt Enable

This read/write bit enables SCI interrupt requests when the TDRE flag

becomes set. Resets clear the TIE bit.

1 = TDRE interrupt requests enabled

0 = TDRE interrupt requests disabled

TCIE — Transmission Complete Interrupt Enable

This read/write bit enables SCI interrupt requests when the TC flag

becomes set. Resets clear the TCIE bit.

1 = TC interrupt requests enabled

0 = TC interrupt requests disabled

RIE — Receiver Interrupt Enable

This read/write bit enables SCI interrupt requests when the RDRF flag

or the OR flag becomes set. Resets clear the RIE bit.

1 = RDRF interrupt requests enabled

0 = RDRF interrupt requests disabled

$000F

Bit 7

6543

Bit 0

Read:

TIE

TCIE

RIE

ILIE

RWU

SBK

Write:

Reset:

00000

Figure 9-10. SCI Control Register 2 (SCCR2)

Freescale Semiconductor, Inc.

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