PIC16F684_07 Datasheet, PDF (37/192 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F684
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
ADC, refer to the appropriate section in this data sheet.
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:
• a general purpose I/O
• an analog input for the ADC
• an analog non-inverting input to the comparator
• In-Circuit Serial Programming data
• an analog input for the Ultra Low-Power Wake-Up
4.2.5.2 RA1/AN1/C1IN-/VREF/ICSPCLK
Figure 4-2 shows the diagram for this pin. The RA1 pin
is configurable to function as one of the following:
• a general purpose I/O
• an analog input for the ADC
• an analog inverting input to the comparator
• a voltage reference input for the ADC
• In-Circuit Serial Programming clock
FIGURE 4-1:
BLOCK DIAGRAM OF RA0
Data Bus
WR
WPUA
RD
WPUA
WR
PORTA
DQ
CK _Q
DQ
CK _Q
Analog⁽¹⁾
Input Mode
RAPU
VDD
Weak
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
VDD
I/O Pin
VSS
Note 1: Comparator mode and ANSEL determines Analog Input mode.
© 2007 Microchip Technology Inc.
DS41202F-page 35