PIC16F883-ESSQTP datasheet(42/338 Pages) MICROCHIP

42 / 338 page

PIC16F882/883/884/886/887

DS41291G-page 42

 2006-2012 Microchip Technology Inc.

3.2

Additional Pin Functions

RA0 also has an Ultra Low-Power Wake-up option. The

next three sections describe these functions.

3.2.1

ANSEL REGISTER

The ANSEL register (Register 3-3) is used to configure

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

appropriate ANSEL 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 ANSEL bits has no affect on digital out-

put 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.

ANSEL: ANALOG SELECT REGISTER

R/W-1

ANS7(2)

ANS6(2)

ANS5(2)

ANS4

ANS3

ANS2

ANS1

ANS0

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 7-0

ANS<7:0>: Analog Select bits

Analog select between analog or digital function on pins AN<7:0>, respectively.

1 = Analog input. Pin is assigned as analog input(1).

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

Note 1:

Setting a pin to an analog input automatically disables the digital input circuitry, weak pull-ups, and

interrupt-on-change if available. The corresponding TRIS bit must be set to Input mode in order to allow

external control of the voltage on the pin.

Not implemented on PIC16F883/886.

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