PIC16F631_08 Datasheet, PDF (66/306 Pages) Microchip Technology – 20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F631/677/685/687/689/690
4.2.5
PIN DESCRIPTIONS AND
DIAGRAMS
Each PORTA pin is multiplexed with other functions. The
pins and their combined functions are briefly described
here. For specific information about individual functions
such as the comparator or the A/D Converter (ADC),
refer to the appropriate section in this data sheet.
FIGURE 4-1:
BLOCK DIAGRAM OF RA0
4.2.5.1 RA0/AN0/C1IN+/ICSPDAT/ULPWU
Figure 4-2 shows the diagram for this pin. The
RA0/AN0/C1IN+/ICSPDAT/ULPWU pin is configurable
to function as one of the following:
• a general purpose I/O
• an analog input for the ADC (except PIC16F631)
• an analog input to Comparator C1
• In-Circuit Serial Programming™ data
• an analog input for the Ultra Low-Power Wake-up
Data Bus
WR
WPUA
RD
WPUA
DQ
CK _Q
Analog⁽¹⁾
Input Mode
VDD
Weak
RABPU
VDD
WR
PORTA
DQ
CK _Q
I/O Pin
VSS
WR
TRISA
DQ
CK _Q
RD
TRISA
RD
PORTA
WR
IOCA
DQ
CK _Q
RD
IOCA
Interrupt-on-Change
-
+
VT
Analog⁽¹⁾
Input Mode
01
IULP
VSS
ULPWUE
QD
EN
Q3
QD
EN
RD PORTA
To Comparator
To A/D Converter⁽²⁾
Note 1: ANSEL determines Analog Input mode.
2: Not implemented on PIC16F631.
DS41262E-page 64
© 2008 Microchip Technology Inc.