MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 211

• Manufacturer Part Number: MC68HC908KX2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

14.8.6 SCI Data Register
14.8.7 SCI Baud Rate Register
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
MOTOROLA
NOTE:
Address:
Address:
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
Do not use read-modify-write instructions on the SCI data register.
The baud rate register (SCBR) selects the baud rate for both the receiver
and the transmitter.
SCP1 and SCP0 — SCI Baud Rate Prescaler Bits
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.
These read/write bits select the baud rate prescaler divisor as shown
in
Serial Communications Interface Module (SCI)
Table
$0018
$0019
Bit 7
Bit 7
R7
T7
0
0
Figure 14-16. SCI Baud Rate Register (SCBR)
14-6. Reset clears SCP1 and SCP0.
Figure 14-15. SCI Data Register (SCDR)
= Unimplemented
R6
T6
6
6
0
0
SCP1
R5
T5
5
5
0
Unaffected by reset
Serial Communications Interface Module (SCI)
SCP0
R4
T4
R
4
4
0
= 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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