MC68340 datasheet(373/441 Pages) FREESCALE

373 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

8- 29

* Module configuration register:

* Timer1 module is set for normal operation, ignore FREEZE.

* Supervisor/user timer1 registers unrestricted.

* Interrupt arbitration at priority $03.

MOVE.W

#$0003,MCR1(A0)

* Initialize timer1 interrupt level to 2 and vector to $0F

MOVE.W

#$020F,IR1(A0)

* Initialize preload 1 to 3

MOVE.W

#$0003,PRLD11(A0)

* Initialize the compare register to 0

CLR.W

COM1(A0)

* Control register 1:

* Enable timer1, no interrupts are enabled, TGATE signal has no effect.

* Use the selected clock for the counter clock, and enable it.

* Selected clock is 1/2 system's freq. Square-wave generation, toggle TOUT.

MOVE.W

#$8205,CR1(A0)

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

END

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

* 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 pulse-width measurement. In this mode, the number

* of clock cycles during a particular event are counted. The event is

* defined by the assertion and negation of TGATE.

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

* 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

Freescale Semiconductor, Inc.

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