MC68HC705MC4MP datasheet(129/180 Pages) FREESCALE

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Serial Communications Interface

SCI I/O Registers

General Release Specification

Serial Communications Interface

11.6.2 SCI Control Register 1

SCI control register 1 has the following functions:

•

Stores ninth SCI data bit received and ninth SCI data bit

transmitted

•

Controls SCI character length

•

Controls SCI wakeup method

R8 — Bit 8 (Received)

When the SCI is receiving 9-bit characters, R8 is the ninth bit of the

received character. R8 receives the ninth bit at the same time that the

SCDR receives the other eight bits. Reset has no effect on the R8 bit.

T8 — Bit 8 (Transmitted)

When the SCI is transmitting 9-bit characters, T8 is the ninth bit of the

transmitted character. T8 is loaded into the transmit shift register at

the same time that SCDR is loaded into the transmit shift register.

Reset has no effect on the T8 bit.

M — Character Length

This read/write bit determines whether SCI characters are eight bits

long or nine bits long. The ninth bit can be used as an extra stop bit,

as a receiver wakeup signal, or as a mark or space parity bit. Reset

has no effect on the M bit.

1 = 9-bit SCI characters

0 = 8-bit SCI characters

Address:

$000B

Bit 7

654321

Bit 0

Read:

WAKE

000

Write:

Reset:

Unaffected by Reset

= Unimplemented

Figure 11-5. SCI Control Register 1 (SCCR1)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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