MC68HC908KX8 Datasheet, PDF (212/310 Pages) Motorola, Inc – Microcontrollers

Serial Communications Interface Module (SCI)
Table 14-6. SCI Baud Rate Prescaling
SCP[1:0]
00
01
10
11
Prescaler Divisor (PD)
1
3
4
13
Technical Data
212
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 this formula to calculate the SCI baud rate:
Baud rate = _{6----4---f--×}^B---^A-P--^U---D-^D---^C--_×-^L---^K_B-----D--
where:
f_BAUDCLK = baud clock 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 CGMXCLK frequency.
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Serial Communications Interface Module (SCI)
MOTOROLA