Datasheet

© 2009 Microchip Technology Inc. DS41288F-page 37
PIC16F610/616/16HV610/616
4.2.4.3 RA2/AN2
(1)
/T0CKI/INT/C1OUT
Figure 4-2 shows the diagram for this pin. The RA2 pin
is configurable to function as one of the following:
• a general purpose I/O
• an analog input for the ADC
(1)
• the clock input for TMR0
• an external edge triggered interrupt
• a digital output from Comparator C1
FIGURE 4-2: BLOCK DIAGRAM OF RA2
Note 1: PIC16F616/16HV616 only.
VDD
VSS
D
Q
CK
Q
D
Q
CK
Q
D
Q
CK
Q
D
Q
CK
Q
VDD
D
EN
Q
D
EN
Q
Weak
RD PORTA
RD
WR
WR
RD
WR
IOAC
RD
IOAC
Interrupt-on-
To INT
Analog
(1)
Input Mode
RAPU
Analog
(1)
Input Mode
Change
Q1
WR
RD
WPUA
Data Bus
WPUA
PORTA
TRISA
TRISA
PORTA
Note 1: Comparator mode and ANSEL determines Analog Input mode.
2: Set has priority over Reset.
3: PIC16F616/16HV616 only.
To A/D Converter
(3)
I/O Pin
S
(2)
R
Q
From other
RA<5:3, 1:0> pins
Write ‘0’ to RAIF
0
1
C1OE
C1OE
Enable
To Timer0