Datasheet

PIC16F630/676
DS40039E-page 26 © 2007 Microchip Technology Inc.
3.3 PORTC
PORTC is a general purpose I/O port consisting of 6 bi-
directional pins. The pins can be configured for either
digital I/O or analog input to A/D converter. For specific
information about individual functions such as the
comparator or the A/D, refer to the appropriate section
in this Data Sheet.
EXAMPLE 3-2: INITIALIZING PORTC
3.3.1 RC0/AN4, RC1/AN5, RC2/AN6, RC3/
AN7
The RC0/RC1/RC2/RC3 pins are configurable to
function as one of the following:
• a general purpose I/O
• an analog input for the A/D Converter
(PIC16F676 only)
FIGURE 3-6: BLOCK DIAGRAM OF
RC0/RC1/RC2/RC3 PINs
3.3.2 RC4 AND RC5
The RC4 and RC5 pins are configurable to function as
a general purpose I/Os.
FIGURE 3-7: BLOCK DIAGRAM OF RC4
AND RC5 PINS
Note: The ANSEL register (91h) must be clear to
configure an analog channel as a digital
input. Pins configured as analog inputs will
read ‘0’. The ANSEL register is defined for
the PIC16F676.
bcf STATUS,RP0 ;Bank 0
clrf PORTC ;Init PORTC
bsf STATUS,RP0 ;Bank 1
clrf ANSEL ;digital I/O
movlw 0Ch ;Set RC<3:2> as inputs
movwf TRISC ;and set RC<5:4,1:0>
;as outputs
bcf STATUS,RP0 ;Bank 0
I/O Pin
VDD
VSS
D
Q
CK
Q
D
Q
CK
Q
Data bus
WR
PORTC
WR
TRISC
RD
TRISC
To A/D Converter
RD
PORTC
Analog Input
Mode
I/O Pin
VDD
VSS
D
Q
CK
Q
D
Q
CK
Q
Data bus
WR
PORTC
WR
TRISC
RD
TRISC
RD
PORTC