PIC16F87T/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F87T/ML

18/20/28-Pin Enhanced Flash MCUs with nanoWatt Technology

Microchip Technology 

PIC16F87/88

TABLE 5-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

Address Name Bit 7 Bit 6

Bit 5

Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Value on

POR, BOR

Value on

all other

Resets

05h

PORTA

RA7 RA6

RA5

RA4 RA3 RA2 RA1 RA0 xxxx 0000(1) uuuu 0000(1)

xxx0 0000(2) uuu0 0000(2)

85h

TRISA TRISA7 TRISA6 TRISA5(3) PORTA Data Direction Register

1111 1111 1111 1111

9Fh

ADCON1 ADFM ADCS2 VCFG1 VCFG0 —

—

—

— 0000 ---- 0000 ----

9Bh

ANSEL(4)

—

ANS6 ANS5 ANS4 ANS3 ANS2 ANS1 ANS0 -111 1111 -111 1111

Legend:

Note 1:

2:

3:

4:

x = unknown, u = unchanged, - = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.

This value applies only to the PIC16F87.

This value applies only to the PIC16F88.

Pin 5 is an input only; the state of the TRISA5 bit has no effect and will always read ‘1’.

PIC16F88 device only.

FIGURE 5-1:

BLOCK DIAGRAM OF RA0/AN0:RA1/AN1 PINS

Data

Bus

WR

PORTA

WR

TRISA

D

Q

CK Q

Data Latch

D

Q

CK Q

TRIS Latch

RD TRISA

VDD

VDD

P

N

I/O pin

VSS

Analog

Input Mode

TTL

Input Buffer

Q

D

EN

RD PORTA

To Comparator

To A/D Module Channel Input (PIC16F88 only)

DS30487D-page 52

 2002-2013 Microchip Technology Inc.

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