MC68340 datasheet(342/441 Pages) FREESCALE

342 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

7- 47

The following steps are channel specific:

Clock Select Register (CSR)

• Select the receiver and transmitter clock.

Mode Register 1 (MR1)

• If desired, program operation of receiver ready-to-send (RxRTS bit).

• Select receiver-ready or FIFO-full notification (R/F bit).

• Select character or block error mode (ERR bit).

• Select parity mode and type (PM and PT bits).

• Select number of bits per character (B/Cx bits).

Mode Register 2 (MR2)

• Select the mode of channel operation (CMx bits).

• If desired, program operation of transmitter ready-to-send (TxRTS bit).

• If desired, program operation of clear-to-send (TxCTS bit).

• Select stop-bit length (SBx bits).

Command Register (CR)

• Enable the receiver and transmitter.

7.5.2 Serial Module Example Configuration Code

The following code is an example of a configuration sequence for the serial module.

***************************************************************************

* MC68340 basic serial module register initialization example code.

* This code is used to initialize the 68340's internal serial module registers,

* providing basic functions for operation.

* It sets up serial channel A for communication with a 9600 baud terminal.

* Note: All serial module registers must be accessed as bytes.

***************************************************************************

* equates

***************************************************************************

MBAR

EQU $0003FF00 Address of SIM40 Module Base Address Reg.

MODBASE

EQU $FFFFF000 SIM40 MBAR address value

***************************************************************

* Serial module equates

SERIAL

EQU $700

Offset from MBAR for serial module regs

MCRH

EQU $0

serial MCR high byte

MCRL

EQU $1

serial MCR low byte

Freescale Semiconductor, Inc.

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