PIC16F684T-E Datasheet, PDF (38/192 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F684
FIGURE 4-2:
Data Bus
DQ
WR
WPUA
CK _Q
RD
WPUA
BLOCK DIAGRAM OF RA1
Analog⁽¹⁾
Input Mode
VDD
Weak
RAPU
DQ
WR
PORTA
CK _Q
WR
TRISA
DQ
CK _Q
RD
TRISA
VDD
I/O Pin
VSS
Analog⁽¹⁾
Input Mode
RD
PORTA
DQ
WR
IOCA
CK _Q
RD
IOCA
QD
EN
Q3
QD
EN
Interrupt-on-
Change
RD PORTA
To Comparator
To A/D Converter
Note 1: Comparator mode and ANSEL determines Analog
Input mode.
4.2.5.3 RA2/AN2/T0CKI/INT/C1OUT
Figure 4-3 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
• the clock input for TMR0
• an external edge triggered interrupt
• a digital output from Comparator 1
FIGURE 4-3:
Data Bus
DQ
WR
WPUA
CK _Q
RD
WPUA
WR
PORTA
DQ
CK _Q
WR
TRISA
DQ
CK _Q
RD
TRISA
BLOCK DIAGRAM OF RA2
Analog⁽¹⁾
Input Mode
VDD
Weak
RAPU
C1OUT
Enable
VDD
C1OUT 1
0
I/O Pin
VSS
Analog⁽¹⁾
Input Mode
RD
PORTA
DQ
WR
IOCA
CK _Q
RD
IOCA
Interrupt-on-
Change
QD
EN
Q3
QD
EN
RD PORTA
To Timer0
To INT
To A/D Converter
Note 1: Analog Input mode is generated by ANSEL.
DS41202F-page 36
© 2007 Microchip Technology Inc.