MC68HC908GR4MP datasheet(265/408 Pages) FREESCALE

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Serial Communications Interface (SCI)

I/O Registers

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Serial Communications Interface (SCI)

265

18.9.6 SCI Data Register

The SCI data register (SCDR) is the buffer between the internal data bus

and the receive and transmit shift registers. Reset has no effect on data

in the SCI data register.

R7/T7–R0/T0 — Receive/Transmit Data Bits

Reading address $0018 accesses the read-only received data bits,

R7:R0. Writing to address $0018 writes the data to be transmitted,

T7:T0. Reset has no effect on the SCI data register.

NOTE:

Do not use read/modify/write instructions on the SCI data register.

18.9.7 SCI Baud Rate Register

The baud rate register (SCBR) selects the baud rate for both the receiver

and the transmitter.

Address:

$0018

Bit 7

654321

Bit 0

Read:

Write:

Reset:

Unaffected by reset

Figure 18-15. SCI Data Register (SCDR)

Address:

$0019

Bit 7

654321

Bit 0

Read:

SCP1

SCP0

SCR2

SCR1

SCR0

Write:

Reset:

00000000

= Unimplemented

= Reserved

Figure 18-16. SCI Baud Rate Register (SCBR)

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