PIC12F639 Microchip Technology, PIC12F639 Datasheet - Page 47
![no-image](/images/manufacturer_photos/0/4/439/microchip_technology_sml.jpg)
PIC12F639
Manufacturer Part Number
PIC12F639
Description
(PIC12F635 / PIC12F636 / PIC12F639) 8/14-PIN FLASH-BASED / 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY
Manufacturer
Microchip Technology
Datasheet
1.PIC12F639.pdf
(196 pages)
- Current page: 47 of 196
- Download datasheet (4Mb)
4.2.4.2
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 to the comparator
• In-Circuit Serial Programming clock
FIGURE 4-2:
© 2005 Microchip Technology Inc.
Data Bus
WPUDA
WPUDA
PORTA
PORTA
TRISA
TRISA
Note 1:
WDA
WDA
IOCA
IOCA
Interrupt-on-
WR
WR
WR
WR
WR
RD
RD
RD
RD
RD
change
D
D
D
D
D
To Comparator
CK
CK
CK
CK
CK
Comparator mode determines Analog Input mode.
RA1/C1IN-/V
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Input Mode
BLOCK DIAGRAM OF RA1
Analog
RD PORTA
REF
RAPU
Input Mode
(1)
Analog
/ICSPCLK
Q
Q
EN
EN
(1)
D
D
V
V
DD
SS
V
V
DD
SS
Weak
Weak
I/O pin
Q3
PIC12F635/PIC16F636/639
Preliminary
4.2.4.3
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
• the clock input for TMR0
• an external edge-triggered interrupt
• a digital output from the comparator
FIGURE 4-3:
Data Bus
WPUDA
WPUDA
PORTA
PORTA
TRISA
TRISA
WDA
WDA
IOCA
IOCA
Interrupt-on-
WR
WR
WR
WR
WR
RD
RD
RD
RD
RD
change
D
D
D
D
D
To TMR0
To INT
CK
CK
CK
CK
CK
RA2/T0CKI/INT/C1OUT
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
BLOCK DIAGRAM OF RA2
C1OUT
C1OUT
Enable
RAPU
RD PORTA
Q
Q
1
0
DS41232B-page 45
EN
EN
D
D
V
V
DD
SS
V
V
DD
SS
Weak
Weak
I/O pin
Q3
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