Program Example Of Multifunctional Timer - Fujitsu MB91260B Series Hardware Manual

CHAPTER 11 MULTIFUNCTIONAL TIMER
11.8

Program Example of Multifunctional Timer

Below is a sample multifunctional timer program.
■ Program Example of 16-bit Free-run Timer
●
Processing contents
• When the 16-bit free-run timer is 4 ms, generate a compare-clear interrupt.
• This timer is used to re-generate a compare-clear timer during up count mode.
• 16 MHz is for the machine clock, and 62.5 ns is for the count clock.
●
Coding example
ICR32
TCCSH
CPCLRBH.EQU
; --------------- Main Program ----------------------------------------------
START:
;
;
LOOP
; --------------- Interrupt Program ----------------------------------------------
WARI
;
;
;
294
.EQU 000460H
.EQU 0000A8H
0000A4H
ORG C0000H
:
:
ANDCCR #0EFH
LDI #ICR32,r0
LDI #00H,r1
STB r1,@r0
LDI #CPCLRBH,r0
LDI #0FA00H,r1
STH r1,@r0
LDI #TCCSH,r3
LDI #0110H,r1
STH r1,@r3
STILM #14H
ORCCR #10H
LDI #00H,r0
LDI #01H,r1
BRA LOOP
LDI #0100H,r1
ANDH r1,@r3
:
User processing
:
; 16-bit free-run timer compare-clear interrupt control register
; Timer control status register
; Compare-clear buffer register
; Assumes that the stack pointer (SP) has already been
; initialized.
; Disables the interrupt.
; Interrupt levels 16 (strength)
; Set a value in the compare-clear buffer register to
; generate a compare-clear interrupt at 4 ms when the
; 16-bit free-run timer is in up count mode.
; Up count down mode,
; 62.5 ns count clock setting,
; Compare-clear interrupt enable,
; Clear the interrupt flag bit for compare clearing.
; Disable interrupt masking,
; Clear timer and enable operation.
; ILM in PS is set to level 20
; Interruption permission
; Infinite loop
;
; Clear interrupt request flag.