Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
SCR2 – SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate divisor as shown in
Table 17-7. Reset clears SCR2–SCR0.
Table 17-7. SCI Baud Rate Selection
SCR[2:1:0]
000
Baud Rate Divisor (BD)
1
2
001
010
4
011
8
100
16
32
64
128
101
110
111
Use this formula to calculate the SCI baud rate:
fCrystal
Baud rate = -----------------------------------
64 × PD × BD
where:
fCrystal = crystal frequency
PD = prescaler divisor
BD = baud rate divisor
Table 17-8 shows the SCI baud rates that can be generated with a
4.9152-MHz crystal.
Technical Data
MC68HC908AS60 — Rev. 1.0
Serial Communications Interface (SCI)
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