PIC16F946-ESLASHMLQTP datasheet(45/330 Pages) MICROCHIP

45 / 330 page

DS41250F-page 43

PIC16F913/914/916/917/946

3.0

I/O PORTS

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)

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.

3.1

ANSEL Register

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.

Note 1: PIC16F914/917 and PIC16F946 only.

2: PIC16F946 only

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.

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

= 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.

PIC16F914/PIC16F917/PIC16F946 only.

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