MC68HC08GP32A Datasheet, PDF (159/258 Pages) Freescale Semiconductor, Inc – Microcontrollers

Table 14-6. SCI Baud Rate Prescaling
SCP1 and SCP0
00
01
10
11
Prescaler Divisor (PD)
1
3
4
13
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
SCR2, SCR1, and SCR0
000
001
010
011
100
101
110
111
Baud Rate Divisor (BD)
1
2
4
8
16
32
64
128
Use this formula to calculate the SCI baud rate:
Baud rate = ^{S----C-----I---c---l--o---c---k-----s---o---u---r--c---e--}
64 × PD × BD
where:
SCI clock source = f_BUS or CGMXCLK (selected by SCIBDSRC bit in MOR2)
PD = prescaler divisor
BD = baud rate divisor
Table 14-8 shows the SCI baud rates that can be generated with a 4.9152-MHz bus clock when f_BUS is
selected as SCI clock source.
MC68HC08GP32A • MC68HC08GP16A Data Sheet, Rev. 1.0
Freescale Semiconductor
159