Sample Programs For The Pwc Timer - Fujitsu MB90460 Series Hardware Manual

CHAPTER 16 PWC Timer
16.8

Sample Programs for the PWC Timer

This section contains sample programs for the PWC timer.
■ Sample Program for the PWC Timer
●
Processing
• An output PWO0 of 30.6 Hz is generated with PWC timer 0.
• The PWC is used in reload timer mode to repeatedly generate an overflow interrupt.
2
• EI OS is not used.
• 16 MHz is used for the machine clock, and 0.25 µs is used for the count clock.
●
Coding example
ICR01
PWCS0
PWC0
OVIR
;-------Main program------------------------------------------------------------------------------------------------
CODE
START:
;
LOOP:
;-------Interrupt program--------------------------------------------------------------------------------------------
WARI:
;
464
EQU 0000B1H
EQU 000008H
EQU 00000AH
EQU PWCS0:11
CSEG
:
AND CCR,#0BFH
MOV I:ICR01,#00H
MOVW I:PSC0,#0FF00H
MOVW I:PWCS0,#4409H
MOV ILM,#07H
OR CCR,#40H
MOV A,#00H
MOV A,#01H
BRA LOOP
CLRB I:OVIR
:
;Interrupt control register for the PWC timer
;PWC control status register
;PWC data buffer register
;Interrupt request flag bit
;Assumes that stack pointer (SP) has already been
initialized
;Interrupt disable
;Interrupt level 0 (strongest)
;Sets the reload value
;Sets reload timer mode, 0.25µ s clock
;Enable PWC output
;Sets overflow interrupt
;Clears interrupt flag and starts PWC timer
;Sets ILM in PS to level 7
;Interrupt enable
;Endless loop
;
;
;Clears interrupt request flag