Port0=7-seg of minutes tens/units
return
If h>23 then h=0
If m>59 then m=0: h=h+1
If s>59 then s=0: m=m+1
S=s+1
I second interrupt
M=m-1 : if m<0 then m=59
M=m+1: if m>59 then m=0
H=h-1: if h<0 then h=0
M + pressed ?
H- pressed ?
H=h+1 : if h>23 then h=0
H+ pressed ?
Port2=16/32 (digit s1s2 shown)
Port2=4/8 (digit m1m2 shown)
Port2=1 (digit h1 shown)
Port2=2 (digit h2 shown)
Port0=7-seg of seconds tens/units
Port0=7-seg of hours(units)
Port0=7-seg of hours(tens)
Start 1 sec timer
H=0:m=0:s=0
start
bobw1