Datasheet

Serial Communications Interface (SCI)
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
202 Freescale Semiconductor
Use the following formula to calculate the SCI baud rate:
where:
f
Crystal
= crystal frequency
PD = prescaler divisor
BD = baud rate divisor
Table 18-11 shows the SCI baud rates that can be generated with a 4.9152-MHz crystal.
Table 18-10. SCI Baud Rate Selection
SCR[2:1:0] Baud Rate Divisor (BD)
000 1
001 2
010 4
011 8
100 16
101 32
110 64
111 128
Baud rate
f
Crystal
64 PD BD××
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