portb.txt

Hitech microchip PIC C18 Compiler

Title: portb

Target: PIC18C658

Description:
    A demonstration PORTB, the interruptable port. External influences
    on PORTB can trigger up to 5 different interrupts. There are 4
    edge triggered interrupt sources on pins 0-3. The fifth interrupt
    occurs if there is any change on input pins 4-7.

Controls:
    A RED DIP switch is used to act on PORTB pins 0-3. These are the
    pins that trigger an interrupt is the correct edge sensitive
    event has been detected. To select between rising or falling edge
    interrupts, use the switch. When such an interrupt has occurred,
    the corresponding yellow LED will blink for a period of time.

    A BLUE DIP switch acts on PORTB pins 4-7. These pins will cause
    an interrupt on any change at all. The interrupt routine itself
    interprets what kind of change has occurred.

    A low to high transition will cause a BLUE LED to blink for a
    period of time, whereas a HIGH to LOW transition will cause the
    GREEN LED to blink for a period of time.

Connections to the PIC18C658:
    LED YELLOW [0:3] -> PORTC[0:3]
    DIP RED [1:4]    -> PORTB[0:3]
    Switch 1         -> PORTA5
    LED BLUE [0:3]   -> PORTC[4:7]
    DIP BLUE [1:4]   -> PORTB[4:7]
    LED GREEN        -> PORTA6