MC68340 datasheet(45/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

2- 11

2.13 SERIAL MODULE SIGNALS

The following signals are used by the serial module for data and clock signals. See

Section 7 Serial Module for more information on these signals.

2.13.1 Serial Crystal Oscillator (X2, X1)

These pins furnish the connection to a crystal or external clock, which must be supplied

when using the baud rate generator. An external clock is connected to the X1 pin; X2 is

left floating.

2.13.2 Serial External Clock Input (SCLK)

This input can be used as the external clock input for channel A or channel B, bypassing

the baud rate generator.

2.13.3 Receive Data (RxDA, RxDB)

These signals are the receiver serial data input for each channel. Data received on this

signal is sampled on the rising edge of the clock source, with the least significant bit

received first.

2.13.4 Transmit Data (TxDA, TxDB)

These signals are the transmitter serial data output for each channel. The output is held

high ('mark' condition) when the transmitter is disabled, idle, or operating in the local

loopback mode. Data is shifted out on this signal at the falling edge of the clock source,

with the least significant bit transmitted first.

2.13.5 Clear to Send

(CTSA, CTSB)

These active-low signals can be programmed as the clear-to-send inputs for each

channel.

2.13.6 Request to Send

(RTSA, RTSB)

These active-low signals can be programmed as request-to-send outputs or used as

discrete outputs.

RTSB, RTSA

When used for this function, these signals function as the request-to-send outputs.

OP1, OP0

When used for this function, these outputs are controlled by the value of bit 1 and bit 0,

respectively, in the output port data registers.

2.13.7 Transmitter Ready

≈RDYA)

This active-low output can be programmed as the channel A transmitter ready status

indicator or used as a discrete output.

Freescale Semiconductor, Inc.

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