HCS08 datasheet(173/290 Pages) MOTOROLA

173 / 290 page

Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

173

MC9S08GB/GT

11.2 Features

Features of SCI module include:

•

Full-duplex, standard non-return-to-zero (NRZ) format

•

Double buffered transmitter and receiver with separate enables

•

Programmable baud rates (13-bit modulo divider)

•

Interrupt-driven or polled operation:

–

Transmit data register empty and transmission complete

–

Receive data register full

–

Receive overrun, parity error, framing error, and noise error

–

Idle receiver detect

•

Hardware parity generation and checking

•

Programmable 8-bit or 9-bit character length

•

Receiver wakeup by idle-line or address-mark

11.3 SCI System Description

The SCI allows full-duplex, asynchronous, NRZ serial communication among the MCU and remote

devices, including other MCUs. The SCI comprises of a baud rate generator, transmitter and receiver

block. The transmitter and receiver operate independently, although they use the same baud rate generator.

During normal operation, the MCU monitors the status of the SCI, writes the data to be transmitted, and

processes received data. The following describes each of the blocks of the SCI.

11.4 Baud Rate Generation

As shown in Figure 11-2, the clock source for the SCI baud rate generator is the bus-rate clock.

Figure 11-2 SCI Baud Rate Generation

SBR12:SBR0

DIVIDE BY

Tx BAUD RATE

Rx SAMPLING CLOCK

(16

× BAUD RATE)

BAUD RATE GENERATOR

OFF IF [SBR12:SBR0] = 0

BUSCLK

BAUD RATE =

BUSCLK

[SBR12:SBR0]

× 16

MODULO DIVIDE BY

(1 THROUGH 8191)

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