PIC16CR74ESLASHP datasheet(38/172 Pages) MICROCHIP

38 / 172 page

PIC16CR7X

DS21993C-page 36

4.4

PORTD and TRISD Registers

This section is not applicable to the PIC16CR73 or

PIC16CR76.

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 micro-

processor port (Parallel Slave Port) by setting control

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

buffers are TTL.

FIGURE 4-6:

PORTD BLOCK DIAGRAM

(IN I/O PORT MODE)

TABLE 4-7:

PORTD FUNCTIONS

TABLE 4-8:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTD

Data Bus

WR Port

WR 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

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

bit 2

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

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:

= unknown, u = unchanged, – = unimplemented read as ‘0’. Shaded cells are not used by PORTD.

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