MC68340 datasheet(372/441 Pages) FREESCALE

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8- 28

MC68340 USER’S MANUAL

MOTOROLA

• Enable the counter prescaler (CPE bit).

• Select the selected clock (CLK bit).

• If the PCLK bit is set, select the POTx bits.

• Select the mode of operation (MODEx bits).

• Select the operation of TOUT (OCx bits).

8.5.2 Timer Module Example Configuration Code

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

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

* MC68340 basic timer module register initialization example code.

* This code is used to initialize the 68340's internal timer module

* registers, providing basic functions for operation.

* It sets up timer1 for square wave generation.

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

* equates

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

MBAR

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

MODBASE

EQU $FFFFF000 SIM40 MBAR address value

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

* Timer1 module equates

TIMER1

EQU $600

Offset from MBAR for timer1 module regs

MCR1

EQU $0

MCR for timer1

* Timer1 register offsets from timer1 base address

IR1

EQU

$604

interrupt register timer1

CR1

EQU

$606

control register timer1

SR1

EQU

$608

status register timer1

CNTR1

EQU

$60A

counter register timer1

PRLD11

EQU

$60C

preload register 1 timer1

COM1

EQU

$610

compare register timer1

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

* Initialize Timer1

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

LEA

MODBASE+TIMER1,A0

Pointer to timer1 module

* Disable timer1

CLR.W

CR1(A0)

* Clear the TO, TG, and TC bits

CLR.W

SR1(A0)

Freescale Semiconductor, Inc.

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