Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SSOP 20 8-Bit 20 MHz I/O number 11

PIC12F635/PIC16F636/639

4.2.4.2 RA1/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 to the comparator

• In-Circuit Serial Programming™ clock

FIGURE 4-2: BLOCK DIAGRAM OF RA1

4.2.4.3 RA2/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

• the clock input for Timer0

• an external edge-triggered interrupt

• a digital output from the comparator

FIGURE 4-3: BLOCK DIAGRAM OF RA2

I/O pin

VDD

VSS

Data Bus

WPUDA

RD PORTA

PORTA

TRISA

IOCA

Interrupt-on-

To Comparator

RAPU

Analog

Input Mode

(1)

change

WDA

VDD

Weak

VSS