MC68HC908AZ60 Datasheet, PDF (236/480 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Serial Communications Interface Module (SCI)
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.
NOTE: Do not use read-modify-write instructions on the SCI data register.
SCI Baud Rate
Register
The baud rate register selects the baud rate for both the receiver and the
transmitter.
Address: $0019
Bit 7
6
5
4
3
2
1
Read:
Write:
SCP1 SCP0
R
SCR2 SCR1
Reset: 0
0
0
0
0
0
0
= Unimplemented
R = Reserved
Figure 18. SCI Baud Rate Register (SCBR)
Bit 0
SCR0
0
SCP1 and SCP0 — SCI Baud Rate Prescaler Bits
These read/write bits select the baud rate prescaler divisor as shown
in Table 9. Reset clears SCP1 and SCP0.
SCP[1:0]
00
01
10
11
Table 9. SCI Baud Rate Prescaling
Prescaler Divisor (PD)
1
3
4
13
MC68HC908AZ60 — Rev 2.0
234
Serial Communications Interface Module (SCI)
36-sci
MOTOROLA