MC908GR8CDWE Datasheet, PDF (267/408 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
I/O Registers
Use this formula to calculate the SCI baud rate:
baud rate = _{6----4-----×}---f-P-^B----^U_D---^S---_×----B-----D---
where:
f_BUS = bus frequency
PD = prescaler divisor
BD = baud rate divisor
SCI_BDSRC is an input to the SCI. Normally it will be tied off low at the
top level to select the bus clock as the clock source. This makes the
formula:
baud rate = _{6----4-----×}---f-P-^B----^U_D---^S---_×----B-----D---
Table 18-8 shows the SCI baud rates that can be generated with a
4.9152-MHz bus clock.
MC68HC908GR8 — Rev 4.0
MOTOROLA
Serial Communications Interface (SCI)
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Technical Data
267