Sleep does not really sleep...

[Ioannis]

The interrupt on change is created by a matrix keyboard connected on portB (0-6).

I noticed that a short keypress allows PIC go to sleep, while a longer press keeps it semi awake.

Then I added this while-wend check just before pressed=0 in the main routine and now works OK:

main:
portb=$78   'set port to 01111000
txsta=0     'Turn off all peripherals
rcsta=0     'before sleeping
adcon0.0=0  'Disable ADC
while pressed:pause 10:wend
pressed=0   'reset flag pressed
intcon.0=0  'reset RBIF flag
t1con.0=0   'turn off timmer 1
buzzer=0
@ sleep
@ nop

Though not elegant nor explains why this happens, it kinda fixed the problem.

Ioannis

[Ioannis]

Any idea how can the keyboard matrix scan routine check for key release, before jumps to the keycheck subroutine please?

keyscan:
while 1
    for ix=0 to 2     'scan columns
        portb=~dcd ix 'invert polarity
        keyin=portb & %01111000
        if keyin<>120 then keycheck  'if key is pressed then check it
    next ix
wend

Ioannis