MC68HC908AZ60 Datasheet, PDF (237/480 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Serial Communications Interface Module (SCI)
I/O Registers
SCR2 – SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate divisor as shown in
Table 10. Reset clears SCR2–SCR0.
Table 10. SCI Baud Rate Selection
SCR[2:1:0]
000
001
010
011
100
101
110
111
Baud Rate Divisor (BD)
1
2
4
8
16
32
64
128
Use the following formula to calculate the SCI baud rate:
Baud rate = _{6----4-----×}--f--^C-P--^r--^y_D--^s--^t-^a-_×--^l---B----D---
where:
f_Crystal = crystal frequency
PD = prescaler divisor
BD = baud rate divisor
Table 11 shows the SCI baud rates that can be generated with a
4.9152-MHz crystal.
37-sci
MOTOROLA
MC68HC908AZ60 — Rev 2.0
Serial Communications Interface Module (SCI)
235