Page 257 - Making PIC Microcontroller Instruments and Controllers

uslllc tlMEni cout{TEF foDE 255

lilRXiii!.liaitltll:: Final program for counting marbles Inlo theTMBl counter
(Connecl seruo to J7) (Cort tued)
the
DISASI,E disable interrupts
IMT ROI'TINE. interrupc rou!ine
EOGGIJE PORTB' 1
ITOGGT,E PORAB.I
x-255*!rMRllt + lltRll
IMICON.l-0 reseL tbe intedupt flaq for
RESUIE
ENIIBLE enable in!errupts

GATE_IN !
HIGA PORTC.I
PAUSEUS 2300 CW
r,ow PoRrfc - 1
PAUSE Id
RETORN
GATE_OuI:
HIGII PORTC.I
PAVSELS 750
LOW PORTC.l
PAUSE !!
RETURN
END

f ./Jl
TRANSISTOB

1 MEG

is6.ductng. :-
Fbile !?^3 Dlagram ol the wiring needed to
"nornally
test the counter. (The hiqh oper" cond-
iion here malches the weak high pullup on B O as it
should.)