I am trying, so far in vain, to write some code for a 12C509 device
which has to do the following (shown in pseudo C code):

        Power on Device Reset;

main{
        TRISB(0b11111100);
        CLEAR GPWU; CLEAR GPPU;

        switch (RESET_CAUSE()) {
                case NORMAL_POWER_UP:   GP0=0, GP1-1;
                case MCLR_FROM_SLEEP:   GP0=1, GP1-0;
                case default:           error_handle();
        }

        for(;;){
                if (INPUT(GP3) is TRUE){
                        READ PORT_B;    // 12C509 note, page 35
                        SLEEP();
                }
}

Although the example is not complete the basic code outline should work,
I think ???...

CCS Version 2.464 operating under MPLAB V4.00...

Any suggestions appreciated...

Nino...
--
******************************************************
* Antonio (Nino) Benci                               *
* Electronic Services Manager                        *
* Monash University - Dept of Physics                *
* Wellington Rd, Clayton. 3168                       *
* Victoria, Australia.                               *
* TEL    - 61 3 9905 3649, FAX - 61 3 9905 3637      *
* Mobile - 0414 764 763 (private and ah only)        *
* EMAIL  - nino.benci@sci.monash.edu.au (work)       *
*        - fleatech@excite.com (private)             *
* WWW    - www.physics.monash.edu.au/                *
******************************************************