Sleep does not really sleep...

[Ioannis]

Additional info:

The ADC uses internal Vref of 0.6 volts to check the battery power supply. Before sleep the ADC is switched off.

Also UART is switched off, along with Tmr1 and some ports setting.

The only one that stays as input, is the Portb.7 the Rx pin but even if it is grounded the current stays at 1.8mA.

WDT is disabled.

BOR is disabled.

/MCLR is set as internal and as the data sheet states, there is an internal pull up.

Ioannis

[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