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Serial Communications Interface
15.9.6 SCI Data Register
NOTE:
Technical Data
274
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
Read:
R7
R6
Write:
T7
T6
Reset:
Figure 15-15. 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.
Do not use read/modify/write instructions on the SCI data register.
Serial Communications Interface Module (SCI)
5
4
3
R5
R4
R3
T5
T4
T3
Unaffected by reset
MC68HC908AB32
2
1
Bit 0
R2
R1
R0
T2
T1
T0
Rev. 1.0
—
MOTOROLA
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