s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 162

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface (SCI)
16.8.6 SCI Data Register
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
16.8.7 SCI Baud Rate Register
The baud rate register selects the baud rate for both the receiver and the transmitter.
SCP1 and SCP0 — SCI Baud Rate Prescaler Bits
162
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
and SCP0.
Address:
Address:
Do not use read-modify-write instructions on the SCI data register.
Reset:
Reset:
Read:
Read:
Write:
Write:
$0018
$0019
Bit 7
Bit 7
R7
T7
0
0
Figure 16-18. SCI Baud Rate Register (SCBR)
SCP[1:0]
= Unimplemented
00
01
10
11
Figure 16-17. SCI Data Register (SCDR)
Table 16-9. SCI Baud Rate Prescaling
R6
T6
6
6
0
0
MC68HC908AZ32A Data Sheet, Rev. 2
SCP1
R5
T5
5
5
0
NOTE
Unaffected by Reset
SCP0
R4
T4
R
4
4
0
Prescaler Divisor (PD)
= Reserved
R3
T3
R
3
3
0
13
1
3
4
SCR2
R2
T2
2
2
0
Table
SCR1
R1
T1
1
1
0
16-9. Reset clears SCP1
Freescale Semiconductor
SCR0
Bit 0
Bit 0
R0
T0
0