PIC16LC773T-20/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC773T-20/SS

28/40-Pin, 8-Bit CMOS Microcontrollers w/ 12-Bit A/D

Microchip Technology 

PIC16C77X

3.4 PORTD and TRISD Registers

This section is applicable to the 40/44-pin devices only.

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

fers. 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 3-10: PORTD BLOCK DIAGRAM (IN

I/O PORT MODE)

Data

bus

WR

PORT

D

Q

CK

I/O pin(1)

WR

TRIS

Data Latch

DQ

CK

TRIS Latch

Schmitt

Trigger

input

buffer

RD TRIS

Q

D

RD PORT

ENEN

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

TABLE 3-7 PORTD FUNCTIONS

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.

TABLE 3-8 SUMMARY OF REGISTERS ASSOCIATED WITH PORTD

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

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.

uuuu uuuu

1111 1111

0000 -111

DS30275B-page 34

Advance Information

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