PIC16F688
4.2.5
PIN DESCRIPTIONS AND
DIAGRAMS
4.2.5.1
RA0/AN0/C1IN+/ICSPDAT/ULPWU
Figure 4-1 shows the diagram for this pin. The RA0 pin
is configurable to function as one of the following:
Each PORTA pin is multiplexed with other functions.
The pins and their combined functions are briefly
described here. For specific information about individ-
ual functions such as the comparator or the A/D, refer
to the appropriate section in this data sheet.
• a general purpose I/O
• an analog input for the A/D
• an analog input to the comparator
• an analog input to the Ultra Low-Power Wake-up
• In-Circuit Serial Programming™ data
FIGURE 4-1:
BLOCK DIAGRAM OF RA0
Analog(1)
Input Mode
VDD
Data Bus
D
Q
Q
Weak
CK
WR
WPUDA
RAPU
RD
VDD
WPUDA
D
Q
Q
I/O PIN
WR
CK
PORTA
VSS
-
+
VT
D
Q
Q
WR
TRISA
CK
IULP
0
1
RD
TRISA
Analog(1)
Input Mode
Vss
ULPWUE
RD
PORTA
D
Q
Q
Q
D
D
CK
WR
IOCA
Q3
EN
RD
IOCA
Q
EN
Interrupt-on-
Change
RD PORTA
To Comparator
To A/D Converter
Note 1: Comparator mode and ANSEL determines analog Input mode.
© 2007 Microchip Technology Inc.
DS41203C-page 37
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