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2000 Microchip Technology Inc.

DS30605C-page 35

PIC16C63A/65B/73B/74B

5.5

PORTE and TRISE Register

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

(PIC16C74B 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.

FIGURE 5-7:

PORTE BLOCK DIAGRAM

TABLE 5-9:

PORTE FUNCTIONS

Note 1: The PIC16C63A and PIC16C73B do not

provide PORTE. The PORTE and TRISE

registers are not implemented.

2: The PIC16C63A/65B does not provide an

A/D module. A/D functions are not imple-

mented.

Note:

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

figured as analog inputs and read as ‘0’s.

Data

Bus

Port

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

RE0/RD/AN5

bit0

ST/TTL(1)

Input/output port pin or read control input in Parallel Slave Port mode or analog

input:

1 = Idle

0 = Read operation. Contents of PORTD register is output to PORTD

I/O pins (if chip selected).

RE1/WR/AN6

bit1

ST/TTL(1)

Input/output port pin or write control input in Parallel Slave Port mode or analog

input:

1 = Idle

0 = Write operation. Value of PORTD I/O pins is latched into PORTD

RE2/CS/AN7

bit2

ST/TTL(1)

Input/output port pin or chip select control input in Parallel Slave Port mode or

analog input:

1 =

Device is not selected

0 =

Device is selected

Legend:

ST = Schmitt Trigger input, TTL = TTL input

Note

Input buffers are Schmitt Triggers when in I/O mode and TTL buffers when in Parallel Slave Port mode.

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