MC68HC908GR4MP datasheet(184/286 Pages) FREESCALE

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Serial Communications Interface (SCI)

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

184

Freescale Semiconductor

SCP1 and SCP0 — SCI Baud Rate Prescaler Bits

These read/write bits select the baud rate prescaler divisor as shown in Table 18-6. Reset clears SCP1

and SCP0.

SCR2–SCR0 — SCI Baud Rate Select Bits

These read/write bits select the SCI baud rate divisor as shown in Table 18-7. Reset clears

SCR2–SCR0.

Use this formula to calculate the SCI baud rate:

where:

fBUS = bus frequency

PD = prescaler divisor

BD = baud rate divisor

SCIBDSRC from the configuration register is an input to the SCI. With SCIBDSRC = 1 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.

Table 18-6. SCI Baud Rate Prescaling

SCP1 and SCP0

Prescaler Divisor (PD)

Table 18-7. SCI Baud Rate Selection

SCR2, SCR1, and SCR0

Baud Rate Divisor (BD)

000

001

010

011

100

101

110

111

128

baud rate

f BUS

------------------------------------

baud rate

f BUS

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