mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 240

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface (SCI)
17.9.6 SCI Data Register
17.9.7 SCI Baud Rate Register
Technical Data
238
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
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
Figure 17-14. SCI BAUD Rate Register 1 (SCBR)
R7
T7
R
R
0
Figure 17-13. SCI Data Register (SCDR)
= Reserved
R6
T6
R
6
6
0
SCP1
R5
T5
5
5
0
Unaffected by reset
SCP0
R4
T4
4
4
0
R3
T3
R
3
3
0
SCR2
R2
Freescale Semiconductor
T2
2
2
0
MC68HC08QA24
SCR1
R1
T1
1
1
0
SCR0
Bit 0
Bit 0
R0
T0
0