PIC16F688

Manufacturer Part NumberPIC16F688
ManufacturerMicrochip Technology Inc.
PIC16F688 datasheet
 


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PIC16F688
4.2.5.2
RA1/AN1/C1IN-/V
/ICSPCLK
REF
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 A/D
• an analog input to the comparator
• a voltage reference input for the A/D
• In-Circuit Serial Programming™ clock
FIGURE 4-2:
BLOCK DIAGRAM OF RA1
(1)
Analog
Data Bus
Input Mode
D
Q
WR
CK
Q
WPUA
RAPU
RD
WPUA
D
Q
WR
CK
Q
PORTA
D
Q
WR
CK
Q
TRISA
(1)
Analog
Input Mode
RD
TRISA
RD
PORTA
D
Q
Q
D
WR
CK
Q
IOCA
EN
RD
IOCA
Q
D
EN
Interrupt-on-
change
RD PORTA
To Comparator
To A/D Converter
Note 1:
Comparator mode and ANSEL determines analog
Input mode.
DS41203C-page 38
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 A/D
• the clock input for Timer0
• an external edge triggered interrupt
• a digital output from the comparator
FIGURE 4-3:
Data Bus
D
V
DD
WR
CK
Weak
WPUA
RD
WPUA
V
DD
D
WR
CK
PORTA
I/O pin
D
WR
CK
V
TRISA
SS
RD
TRISA
RD
PORTA
D
CK
WR
IOCA
Q3
RD
IOCA
Interrupt-on-
change
To Timer0
To INT
To A/D Converter
Note 1:
Analog Input mode is based upon ANSEL.
BLOCK DIAGRAM OF RA2
(1)
Analog
Input Mode
Q
V
DD
Q
Weak
RAPU
C1OUT
Enable
V
DD
Q
Q
C1OUT
1
0
I/O pin
Q
Q
V
SS
(1)
Analog
Input Mode
Q
Q
D
Q
Q3
EN
Q
D
EN
RD PORTA
© 2007 Microchip Technology Inc.