PIC16F916-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F916-I/ML

28/40/44/64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

Microchip Technology 

PIC16F913/914/916/917/946

3.0 I/O PORTS

3.1 ANSEL Register

The PIC16F913/914/916/917/946 family of devices

includes several 8-bit PORT registers along with their

corresponding TRIS registers and one four bit port:

• PORTA and TRISA

• PORTB and TRISB

• PORTC and TRISC

• PORTD and TRISD(1)

• PORTE and TRISE

• PORTF and TRISF(2)

• PORTG and TRISG(2)

Note 1: PIC16F914/917 and PIC16F946 only.

2: PIC16F946 only

The ANSEL register (Register 3-1) 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.

PORTA, PORTB, PORTC and RE3/MCLR/VPP are

implemented on all devices. PORTD and RE<2:0>

(PORTE) are implemented only on the PIC16F914/917

and PIC16F946. RE<7:4> (PORTE), PORTF and

PORTG are implemented only on the PIC16F946.

REGISTER 3-1: ANSEL: ANALOG SELECT REGISTER

R/W-1

ANS7(2)

bit 7

R/W-1

ANS6(2)

R/W-1

ANS5(2)

R/W-1

ANS4

R/W-1

ANS3

R/W-1

ANS2

R/W-1

ANS1

R/W-1

ANS0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘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:

2:

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.

PIC16F914/PIC16F917/PIC16F946 only.

© 2007 Microchip Technology Inc.

DS41250F-page 43

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