PIC16F722AT-ISLASHSP datasheet(49/284 Pages) MICROCHIP

49 / 284 page

 2010 Microchip Technology Inc.

DS41417A-page 49

PIC16F/LF722A/723A

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.

ANSELA: PORTA ANALOG SELECT REGISTER

U-0

R/W-1

—

ANSA5

ANSA4

ANSA3

ANSA2

ANSA1

ANSA0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-6

Unimplemented: Read as ‘0’

bit 5-0

ANSA<5:0>: Analog Select between Analog or Digital Function on pins RA<5:0>, 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.

PIC16F722AT-I/SP Datasheet(PDF) 49 Page - Microchip Technology

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