PIC16F707-ESLASHML datasheet(53/284 Pages) MICROCHIP

53 / 284 page

 2010 Microchip Technology Inc.

Preliminary

DS41418A-page 53

PIC16F707/PIC16LF707

6.2.1

ANSELA REGISTER

The ANSELA register (Register 6-4) is used to

configure the Input mode of an I/O pin to analog.

Setting the appropriate ANSELA bit high will cause all

digital reads on the pin to be read as ‘0’ and allow

analog functions on the pin to operate correctly.

The state of the ANSELA bits has no affect on digital

output functions. A pin with TRIS clear and ANSEL set

will still operate as a digital output, but the Input mode

will be analog. This can cause unexpected behavior

when executing read-modify-write instructions on the

affected port.

6.2.2

PIN DESCRIPTIONS

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 A/D Converter (ADC), refer to the

appropriate section in this data sheet.

6.2.2.1

RA0/AN0/VCAP

The RA0 pin is configurable to function as one of the

following:

• General purpose I/O

• Analog input for the A/D

• Slave Select input for the SSP(1)

• Voltage Regulator Capacitor pin (PIC16F707

only)

6.2.2.2

RA1/AN1/CPSA0

The RA1 pin is configurable to function as one of the

following:

• General purpose I/O

• Analog input for the A/D

• Capacitive sensing input

6.2.2.3

RA2/AN2/CPSA1/DACOUT

The RA2 pin is configurable to function as one of the

following:

• General purpose I/O

• Analog input for the A/D

• Capacitive sensing input

• DAC Output

ANSELA: PORTA ANALOG SELECT REGISTER

R/W-1

ANSA7

ANSA6

ANSA5

ANSA4

ANSA3

ANSA2

ANSA1

ANSA0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

‘0’ = Bit is cleared

-n = Value at POR

‘1’ = Bit is set

x = Bit is unknown

bit 7-0

ANSA<7:0>: Analog Select between Analog or Digital Function on pins RA<7:0>, respectively

0 = Digital I/O. Pin is assigned to port or digital special function.

1 = Analog input. Pin is assigned as analog input(1). Digital Input buffer disabled.

Note 1:

When setting a pin to an analog input, the corresponding TRIS bit must be set to Input mode in order to

allow external control of the voltage on the pin.

Note 1: SS pin location may be selected as RA5

or RA0.

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