Question ?
What will be the read value of PORTB when interrupt occurs ?

I am implementing a 3x4 key pad interfaced to PORTB of PIC16C74.
TRISB = b'1111 0001'
bit0 = external int form other IC
bit 1:3 = o/p lines pulsing low in sequence to scan keypad
bit 4:7 = i/p lines with Weak Pullups enabled.

Am I correct in saying when a key is pressed it grounds an i/p <4:7> and the
read value for the i/p pin will be high ?

3x4 keypad connections

RB7---+---1----&--&--&         weak pullups enabled
RB6---+---1----&--&--&
RB5---+---1----&--&--&
RB4---+---1----&--&--&
RB3---+---0----&--&--&  scannning pulsing low (0000 1101, 00001011, 0000 0111)
RB2---+---0-------&--&
RB1---+---0----------&
RB0---+---1-----------------to other INT

Any help please ?

ashsparky@clara.net