MC68HC708MP16 Datasheet, PDF (315/398 Pages) Freescale Semiconductor, Inc – Microcontrollers

Serial Communications Interface Module (SCI)
Table 14-5. SCI Baud Rate Prescaling
SCP1:SCP0
00
01
10
11
Prescaler Divisor (PD)
1
3
4
13
SCR2–SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate divisor as shown in
Table 14-6. Reset clears SCR2–SCR0.
Table 14-6. SCI Baud Rate Selection
SCR2:SCR1: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 = _{6----4-----×}---f-P-B----D-u---s--_×----B-----D---
where:
f_Bus = bus frequency
PD = prescaler divisor
BD = baud rate divisor
Table 14-7 shows the SCI baud rates that can be generated with a
4.9152-MHz crystal.
MC68HC708MP16 — Rev. 3.1
Freescale Semiconductor
Serial Communications Interface Module (SCI)
Technical Data
315