HC05 datasheet(120/232 Pages) MOTOROLA

120 / 232 page

MOTOROLA

7-18

MC68HC05X16

Rev. 1

SERIAL COMMUNICATIONS INTERFACE

7.11.5

Baud rate register (BAUD)

The baud rate register provides the means to select two different or equivalent baud rates for the

transmitter and receiver.

SCP1, SCP0 — Serial prescaler select bits

These read/write bits determine the prescale factor, NP, by which the internal processor clock is

divided before it is applied to the transmitter and receiver rate control dividers, NT and NR. This

common prescaled output is used as the input to a divider that is controlled by the SCR0–SCR2

bits for the SCI receiver, and by the SCT0–SCT2 bits for the transmitter.

SCT2, SCT1, SCT0 — SCI rate select bits (transmitter)

These three read/write bits select the baud rates for the transmitter. The prescaler output is divided

by the factors shown in Table 7-4.

Address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

State

on reset

SCI baud rate (BAUD)

$000D

SCP1

SCP0

SCT2

SCT1

SCT0

SCR2

SCR1

SCR0 00uu uuuu

Table 7-3 First prescaler stage

SCP1

SCP0

Prescaler

division ratio (NP)

Table 7-4 Second prescaler stage (transmitter)

SCT2

SCT1

SCT0

Transmitter

division ratio (NT)

000

001

010

011

100

101

110

111

128

118

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