PIC12: General purpose I/O (GPIO)
GPIO on PIC12F675
6 inputs/outputs (GP0 – GP5)
1 pin input only(GP3)
note the precedence of analog functions
Depending on which peripherals are enabled, some or all of the pins may not be available as
general purpose I/O
optional weak pull-ups
Associated registry
TRISIO – configuring the data direction: 1 = GPIO pin configured as an input (tri-stated), 0 = GPIO
pin configured as an output.
GPIO – read / write the digital values from/to the particular pin
PIC12: General purpose I/O (GPIO) [src.athaj.cz]
1 z 2 27.3.2013 11:59
WPU –
enable/disable weak pull-ups
ANSEL – configure the analog/digital function
Others: IOC, CMCON
Using GPIO in C
char c;
/* init */
CMCON = 7; // disable comparator
ANSEL = 0; // disble analog functions
TRISIO = 0; // set all pins as output
TRIS2 = 1; // set GP2 as input
/* main program */
c = 0b01010101; // define pattern
GPIO = c; // assign pattern to GPIO
GPIO4 = 0; // assign value to a single LED
c = GPIO2; // either 0 or 1 will be assigned
auth/picembc/pic12_gpio.txt — Last modified: 2013/03/26 20:24 by res
PIC12: General purpose I/O (GPIO) [src.athaj.cz]
2 z 2 27.3.2013 11:59