12.7 Program Example For Watch Prescaler - Fujitsu F2MC-8L Series Hardware Manual

12.7 Program Example for Watch Prescaler

This section provides a program example for the watch prescaler.
Program Example for Watch Prescaler
Processing description
Repeatedly generates a watch interrupt of 2
is 1 second (during operation at 32.768 kHz).
Coding example
WPCR EQU
WIF EQU
ILR2 EQU
INT_V DSEG
ORG
IRQ7 DW
INT_V ENDS
;-----Main program----------------------------------------------------------------------------------------------------------------------------------------
CSEG
:
CLRI
MOV
MOV
SETI
:
;-----Interrupt processing routine----------------------------------------------------------------------------------------------------------------------
WARI CLRB
PUSHW
XCHW
PUSHW
:
000BH
WPCR:7
007DH
ABS
FFEAH
WARI
ILR2,#10111111B
WPCR,#01000110B
WIF
A
A,T
A
12.7 Program Example for Watch Prescaler
15
/F (F : subclock oscillation). The time interval
CL CL
; Address of the watch prescaler control register
; Define the watch interrupt request flag bit.
; Address of interrupt level setting register
; [DATA SEGMENT]
; Set the interrupt vector.
; [CODE SEGMENT]
; Initialize stack pointer (SP) etc.
; Disable interrupts.
; Set interrupt level to 2.
; Clear the interrupt request flag and enable interrupt
; request output.
15
; Select 2 /F and clear the watch prescaler.
CL
; Enable interrupts.
; Clear interrupt request flag.
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