diff options
Diffstat (limited to 'electronics/asm/stack.asm')
| -rw-r--r-- | electronics/asm/stack.asm | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/electronics/asm/stack.asm b/electronics/asm/stack.asm new file mode 100644 index 0000000..c86ca8e --- /dev/null +++ b/electronics/asm/stack.asm @@ -0,0 +1,45 @@ +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'00000000' ; set port A data direction to inputs + movwf TRISA + movlw b'00001111' ; set port B data direction to outputs + movwf TRISB + bcf STATUS,RP0 ; select memory bank 0 + + ;stackptr EQU B10 + tmpdata EQU B9 + + goto main + +main: + ;movlw 0 + ;movwf stackptr + + movlw b'00000001' + movwf PORTA + + movlw b'10100000' ; move 1111 to the output + movwf PORTB + + movlw b'00000000' + movwf PORTA + + movlw b'11111111' + movwf TRISB + + movf PORTB, W + movwf tmpdata + + movlw b'00001111' + movwf TRISB + + swapf tmpdata, W + movwf PORTB + +noend: + goto noend + + END ; ends the program |