PIC16C745SLASHP datasheet(38/158 Pages) MICROCHIP

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PIC16C745/765

DS41124A-page 38

Advanced Information

5.5

PORTE and TRISE Registers

PORTE has three pins, RE0/RD/AN5, RE1/WR/AN6

and RE2/CS/AN7, which are individually configured as

inputs or outputs. These pins have Schmitt Trigger

input buffers.

I/O PORTE becomes control inputs for the micropro-

cessor port when bit PSPMODE (TRISE<4>) is set. In

this mode, the user must make sure that the

TRISE<2:0> bits are set (pins are configured as digital

inputs) and that register ADCON1 is configured for dig-

ital I/O. In this mode, the input buffers are TTL.

trols the parallel slave port operation.

PORTE pins may be multiplexed with analog inputs

(PIC16C765 only). The operation of these pins is

selected by control bits in the ADCON1 register. When

selected as an analog input, these pins will read as ’0’s.

TRISE controls the direction of the RE pins, even when

they are being used as analog inputs. The user must

make sure to keep the pins configured as inputs when

using them as analog inputs.

TRISE bits are used to control the parallel slave port.

FIGURE 5-7:

PORTE BLOCK DIAGRAM

TABLE 5-9:

PORTE(1) FUNCTIONS

Note 1: The

PIC16C745

does

not

provide

PORTE. The PORTE and TRISE registers

are reserved. Always maintain these bits

clear.

Note:

On a Power-on Reset, these pins are con-

figured as analog inputs.

Data

Bus

PORT

TRIS

RD PORT

Data Latch

TRIS Latch

RD TRIS

Schmitt

Trigger

Input

Buffer

I/O pin

To A/D Converter

VDD

Name

Function

Input

Type

Output

Type

Description

RE0/RD/AN5

RE0

CMOS

Bi-directional I/O(1)

TTL

—

Parallel Slave Port control input(1)

AN5

—

A/D Input(1)

RE1/WR/AN6

RE1

CMOS

Bi-directional I/O(1)

TTL

—

Parallel Slave Port control input(1)

AN6

—

A/D Input(1)

RE2/CS/AN7

RE2

CMOS

Bi-directional I/O(1)

TTL

—

Parallel Slave Port data input(1)

AN7

—

A/D Input(1)

Legend:

OD = open drain, ST = Schmitt Trigger

Note 1:

PIC16C765 only.

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