Datasheet

PIC16(L)F720/721
DS40001430E-page 52  2010-2013 Microchip Technology Inc.
FIGURE 6-4: BLOCK DIAGRAM OF RA3 FIGURE 6-5: BLOCK DIAGRAM OF RA4
Input
V
SS
D
Q
CK
Q
D
EN
Q
Data Bus
RD PORTA
RD
PORTA
WR
IOCA
RD
IOCA
Reset
MCLRE
RD
TRISA
VSS
D
EN
Q
MCLRE
VDD
Weak
MCLRE
Interrupt-on-
Change
Pin
Q3
I/O Pin
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
Analog
Input mode
Data Bus
WR
WPUA
RD
WPUA
RD
PORTA
WR
PORTA
WR
TRISA
RD
TRISA
WR
IOCA
RD
IOCA
FOSC/4
To A/D Converter
CLKOUT
0
1
CLKOUT
Enable
Enable
Analog
(2)
Input mode
RABPU
RD PORTA
To T 1 G
INTOSC/
RC/EC
(1)
CLK
modes
CLKOUT
Enable
Note 1: With CLKOUT option.
2: ANSEL determines Analog Input mode.
Interrupt-on-
Change
Q3