Datasheet

Serial Communications Interface (SCI)
I/O Registers
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Serial Communications Interface (SCI) 267
Use this formula to calculate the SCI baud rate:
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:
Table 18-8 shows the SCI baud rates that can be generated with a
4.9152-MHz bus clock.
baud rate
f
BUS
64 PD BD××
------------------------------------=
baud rate
f
BUS
64 PD BD××
------------------------------------=
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc...