HCS08 datasheet(182/290 Pages) MOTOROLA

182 / 290 page

Serial Communications Interface (SCI) Module

MC9S08GB/GT

182

MOTOROLA

11.10.1 SCI x Baud Rate Registers (SCIxBDH, SCIxBHL)

This pair of registers controls the prescale divisor for SCI baud rate generation. To update the 13-bit baud

rate setting [SBR12:SBR0], first write to SCIxBDH to buffer the high half of the new value and then write

to SCIxBDL. The working value in SCIxBDH does not change until SCIxBDL is written.

SCIxBDL is reset to a non-zero value, so after reset the baud rate generator remains disabled until the first

time the receiver or transmitter is enabled (RE or TE bits in SCIxC2 are written to 1).

Figure 11-5 SCI Baud Rate Register (SCIxBDH)

Figure 11-6 SCI x Baud Rate Register (SCIxBDL)

SBR12:SBR0 — Baud Rate Modulo Divisor

These 13 bits are referred to collectively as BR, and they set the modulo divide rate for the SCI baud

rate generator. When BR = 0, the SCI baud rate generator is disabled to reduce supply current. When

BR = 1 to 8191, the SCI baud rate = BUSCLK/(16

×BR).

11.10.2 SCI x Control Register 1 (SCIxC1)

This read/write register is used to control various optional features of the SCI system.

Figure 11-7 SCI x Control Register 1 (SCIxC1)

Bit 7

654321

Bit 0

Read:

SBR12

SBR11

SBR10

SBR9

SBR8

Write:

Reset:

00000000

= Unimplemented or Reserved

Bit 7

654321

Bit 0

Read:

SBR7

SBR6

SBR5

SBR4

SBR3

SBR2

SBR1

SBR0

Write:

Reset:

00000100

= Unimplemented or Reserved

Bit 7

54321

Bit 0

Read:

LOOPS

SCISWAI

RSRC

WAKE

ILT

Write:

Reset:

000000

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