MC908GR8CDWE Datasheet, PDF (265/408 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
I/O Registers
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.
Address: $0018
Bit 7
6
5
4
3
2
1
Bit 0
Read: R7
R6
R5
R4
R3
R2
R1
R0
Write: T7
T6
T5
T4
T3
T2
T1
T0
Reset:
Unaffected by reset
Figure 18-15. SCI Data Register (SCDR)
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: $0019
Bit 7
6
5
4
3
2
1
Read:
Write:
SCP1 SCP0
R
SCR2 SCR1
Reset: 0
0
0
0
0
0
0
= Unimplemented
R = Reserved
Figure 18-16. SCI Baud Rate Register (SCBR)
Bit 0
SCR0
0
MC68HC908GR8 — Rev 4.0
MOTOROLA
Serial Communications Interface (SCI)
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Technical Data
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