jens
d61b3c2e0c
git-svn-id: http://moon:8086/svn/vhdl/trunk@1416 cc03376c-175c-47c8-b038-4cd826a8556b
26 lines
1.1 KiB
Plaintext
26 lines
1.1 KiB
Plaintext
;Interrupt example
|
|
;
|
|
CONSTANT waveform_port, 02 ;bit0 will be data
|
|
CONSTANT counter_port, 04
|
|
CONSTANT pattern_10101010, AA
|
|
NAMEREG sA, interrupt_counter
|
|
;
|
|
start: LOAD interrupt_counter, 00 ;reset interrupt counter
|
|
LOAD s2, pattern_10101010 ;initial output condition
|
|
ENABLE INTERRUPT
|
|
;
|
|
drive_wave: OUTPUT s2, waveform_port
|
|
LOAD s0, 07 ;delay size
|
|
loop: SUB s0, 01 ;delay loop
|
|
JUMP NZ, loop
|
|
XOR s2, FF ;toggle waveform
|
|
JUMP drive_wave
|
|
;
|
|
ADDRESS 2B0
|
|
int_routine: ADD interrupt_counter, 01 ;increment counter
|
|
OUTPUT interrupt_counter, counter_port
|
|
RETURNI ENABLE
|
|
;
|
|
ADDRESS 3FF ;set interrupt vector
|
|
JUMP int_routine
|