diff options
Diffstat (limited to 'electronics/asm/timer.asm')
| -rw-r--r-- | electronics/asm/timer.asm | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/electronics/asm/timer.asm b/electronics/asm/timer.asm new file mode 100644 index 0000000..9e412f1 --- /dev/null +++ b/electronics/asm/timer.asm @@ -0,0 +1,40 @@ +start: +init: + clrf PORTA ; make sure port A output latches are low + clrf PORTB ; make sure port B output latches are low + bsf STATUS,RP0 ; select memory bank 1 + movlw b'11111111' ; set port A data direction to inputs + movwf TRISA + movlw b'00000000' ; set port B data direction to outputs + movwf TRISB + bcf STATUS,RP0 ; select memory bank 0 + + bsf INTCON, INT0IE + bsf INTCON, GIE + + counter1 EQU B8 + + goto main + +interrupt: + movf B0, W + movwf counter1 + goto countdown + +countdown: + call wait1000ms + decfsz counter1, F + goto countdown + + bcf INTCON, INT0IF + + retfie + +main: + call readadc0 + movf B0, W + movwf PORTB + + goto main + + END ; ends the program |