MC68HC908GP32 Datasheet, PDF (275/410 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Freescale Semiconductor, Inc.
Serial Communications Interface Module (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 the SCDR accesses the read-only received data bits, R7:R0.
Writing to the SCDR writes the data to be transmitted, T7:T0.
Reset has no effect on the SCDR.
NOTE: Do not use read/modify/write instructions on the SCI data register.
MC68HC908GP32•MC68HC08GP32 — Rev. 6
MOTOROLA
Serial Communications Interface Module (SCI)
For More Information On This Product,
Go to: www.freescale.com
Technical Data
273