PIC16F87X datasheet(35/218 Pages) MICROCHIP

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 1998-2013 Microchip Technology Inc.

DS30292D-page 35

PIC16F87X

3.4

PORTD and TRISD Registers

PORTD and TRISD are not implemented on the

PIC16F873 or PIC16F876.

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

ers. Each pin is individually configureable 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 3-7:

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

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

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 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

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.

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