PIC16F877ATISLASHML datasheet(50/234 Pages) MICROCHIP

50 / 234 page

PIC16F87XA

DS39582B-page 48

 2003 Microchip Technology Inc.

4.4

PORTD and TRISD Registers

PORTD is an 8-bit port with Schmitt Trigger input

buffers. Each pin is individually configurable as an input

or output.

PORTD

can

configured

8-bit

wide

microprocessor port (Parallel Slave Port) by setting

control bit, PSPMODE (TRISE<4>). In this mode, the

input buffers are TTL.

FIGURE 4-8:

PORTD BLOCK DIAGRAM

(IN I/O PORT MODE)

TABLE 4-7:

PORTD FUNCTIONS

TABLE 4-8:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTD

Note:

PORTD and TRISD are not implemented

on the 28-pin devices.

Data

Bus

Port

TRIS

RD Port

Data Latch

TRIS Latch

Schmitt

Trigger

Input

Buffer

I/O pin(1)

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

TRIS

Name

Bit#

Buffer Type

Function

RD0/PSP0

bit 0

ST/TTL(1)

Input/output port pin or Parallel Slave Port bit 0.

RD1/PSP1

bit 1

ST/TTL(1)

Input/output port pin or Parallel Slave Port bit 1.

RD2/PSP2

bit2

ST/TTL(1)

Input/output port pin or Parallel Slave Port bit 2.

RD3/PSP3

bit 3

ST/TTL(1)

Input/output port pin or Parallel Slave Port bit 3.

RD4/PSP4

bit 4

ST/TTL(1)

Input/output port pin or Parallel Slave Port bit 4.

RD5/PSP5

bit 5

ST/TTL(1)

Input/output port pin or Parallel Slave Port bit 5.

RD6/PSP6

bit 6

ST/TTL(1)

Input/output port pin or Parallel Slave Port bit 6.

RD7/PSP7

bit 7

ST/TTL(1)

Input/output port pin or Parallel Slave Port bit 7.

Legend: ST = Schmitt Trigger input, TTL = TTL input

Note 1:

Input buffers are Schmitt Triggers when in I/O mode and TTL buffers 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 1111 1111

89h

TRISE

IBF

OBF

IBOV PSPMODE

—

PORTE Data Direction Bits 0000 -111 0000 -111

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

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