PIC16F870SLASHP datasheet(33/156 Pages) MICROCHIP

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Preliminary

DS30569A-page 33

PIC16F870/871

3.4

PORTD and TRISD Registers

This section is not applicable to the PIC16F870.

PORTD is an 8-bit port with Schmitt Trigger input buff-

ers. Each pin is individually configurable as an input or

output.

PORTD can be configured as an 8-bit wide micropro-

cessor port (parallel slave port) by setting control bit

PSPMODE (TRISE<4>). In this mode, the input buffers

are TTL.

FIGURE 3-6:

PORTD BLOCK DIAGRAM (IN

I/O PORT MODE)

TABLE 3-7:

PORTD FUNCTIONS

TABLE 3-8:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTD

Data

Bus

PORT

TRIS

RD PORT

Data Latch

TRIS Latch

RD TRIS

Schmitt

Trigger

Input

Buffer

I/O pin(1)

Note 1: I/O pins have protection diodes to VDD and VSS.

Name

Bit#

Buffer Type

Function

RD0/PSP0

bit0

ST/TTL(1)

Input/output port pin or parallel slave port bit0

RD1/PSP1

bit1

ST/TTL(1)

Input/output port pin or parallel slave port bit1

RD2/PSP2

bit2

ST/TTL(1)

Input/output port pin or parallel slave port bit2

RD3/PSP3

bit3

ST/TTL(1)

Input/output port pin or parallel slave port bit3

RD4/PSP4

bit4

ST/TTL(1)

Input/output port pin or parallel slave port bit4

RD5/PSP5

bit5

ST/TTL(1)

Input/output port pin or parallel slave port bit5

RD6/PSP6

bit6

ST/TTL(1)

Input/output port pin or parallel slave port bit6

RD7/PSP7

bit7

ST/TTL(1)

Input/output port pin or parallel slave port bit7

Legend: ST = Schmitt Trigger input TTL = TTL input

Note 1: Input buffers are Schmitt Triggers when in I/O mode and TTL buffer when in Parallel Slave Port Mode.

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

08h

PORTD

RD7

RD6

RD5

RD4

RD3

RD2

RD1

RD0

xxxx xxxx

uuuu uuuu

88h

TRISD

PORTD Data Direction Register

1111 1111

89h

TRISE

IBF

OBF

IBOV

PSPMODE

—

PORTE Data Direction Bits

0000 -111

Legend: x = unknown, u = unchanged, - = unimplemented read as ’0’. Shaded cells are not used by PORTD.

PIC16F870/P Datasheet(PDF) 33 Page - Microchip Technology

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