MC908MR16CFUE Datasheet, PDF(159/282 Page) Freescale Semiconductor, Inc – On-chip programming firmware for use with host personal computer, Clock generator module (CGM)

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MC908MR16CFUE Datasheet, PDF (159/282 Pages) Freescale Semiconductor, Inc – On-chip programming firmware for use with host personal computer, Clock generator module (CGM)

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Functional Description

13.3 Functional Description

Figure 13-2 shows the structure of the SCI module. The SCI allows full-duplex, asynchronous, NRZ serial

communication among the MCU and remote devices, including other MCUs. The transmitter and receiver

of the SCI operate independently, although they use the same baud rate generator. During normal

operation, the CPU monitors the status of the SCI, writes the data to be transmitted, and processes

received data.

INTERNAL BUS

SCI DATA

REGISTER

SCI DATA

REGISTER

PTF4/RxD

RECEIVE

SHIFT REGISTER

TRANSMIT

SHIFT REGISTER

SCTIE

TCIE

SCRIE

ILIE

TE

RE

RWU

SBK

fOP

TXINV

R8

T8

SCTE

TC

SCRF

IDLE

WAKEUP

CONTROL

OR

NF

FE

PE

LOOPS

RECEIVE

CONTROL

FLAG

CONTROL

LOOPS

ENSCI

ORIE

NEIE

FEIE

PEIE

TRANSMIT

CONTROL

BKF

ENSCI

RPF

Ã·4

PRE- BAUD RATE

SCALER GENERATOR

M

WAKE

ILTY

PEN

PTY

Ã· 16

DATA SELECTION

CONTROL

PTF5/TxD

Figure 13-2. SCI Module Block Diagram

MC68HC908MR32 â¢ MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

159

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