XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 279

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

18.9.6 SCI Data Register
18.9.7 SCI Baud Rate Register
MC68HC908AZ60A — Rev 2.0
MOTOROLA
NOTE:
Address:
Address:
The SCI data register 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
Do not use read-modify-write instructions on the SCI data register.
The baud rate register selects the baud rate for both the receiver and the
transmitter.
Reset:
Reset:
Read:
Read:
Write:
Write:
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.
Serial Communications Interface (SCI)
$0018
$0019
Bit 7
Bit 7
R7
T7
0
0
Figure 18-18. SCI Baud Rate Register (SCBR)
Figure 18-17. SCI Data Register (SCDR)
= Unimplemented
R6
T6
6
6
0
0
SCP1
R5
T5
5
5
0
Unaffected by Reset
SCP0
R4
T4
R
4
4
0
Serial Communications Interface (SCI)
= Reserved
R3
T3
R
3
3
0
SCR2
R2
T2
2
2
0
SCR1
R1
T1
1
1
0
Technical Data
I/O Registers
SCR0
Bit 0
Bit 0
R0
T0
0
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