MC68HC08AZ32A Datasheet, PDF (195/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

I/O Registers
SCR2 – SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate divisor as shown in Table 14-7. Reset clears
SCR2–SCR0.
Table 14-7. 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---lB-----D---
where:
f_Crystal = crystal frequency
PD = prescaler divisor
BD = baud rate divisor
Table 14-8 shows the SCI baud rates that can be generated with a 4.9152-MHz crystal.
MC68HC08AZ32A Data Sheet, Rev. 2
Freescale Semiconductor
195