MC68340FE16E Datasheet, PDF (372/441 Pages) Freescale Semiconductor, Inc – Integrated Processor with DMA User’s Manual

Freescale Semiconductor, Inc.
• 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)
8-28
MC68340 USER’S MANUAL
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