PIC16F87X Datasheet

IC型号：
PIC16F87X
PDF描述：
28/40-pin 8-Bit CMOS FLASH Microcontrollers
文件大小：
1377.31KB
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PIC16F87X

3.5

PORTE and TRISE Register

FIGURE 3-8:

Data

Bus

PORT

This section is not applicable to the PIC16F873 or

PIC16F876.

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

and RE2/CS/AN7, which are individually configurable

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). Ensure ADCON1 is configured for digital I/O. In

this mode, the input buffers are TTL.

trols the parallel slave port operation.

PORTE pins are multiplexed with analog inputs. When

selected as an analog input, these pins will read as 鈥?鈥檚.

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.

Note:

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

figured as analog inputs.

PORTE BLOCK DIAGRAM (IN

I/O PORT MODE)

I/O pin

(1)

Data Latch

TRIS

Schmitt

Trigger

input

buffer

TRIS Latch

RD TRIS

RD PORT

Note 1:

I/O pins have protection diodes to V

and V

R-0

IBF

bit7

R-0

OBF

R/W-0

IBOV

R/W-0

PSPMODE

U-0

鈥?/div>

R/W-1

bit2

R/W-1

bit1

R/W-1

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n= Value at POR reset

Parallel Slave Port Status/Control Bits

bit 7 :

IBF:

Input Buffer Full Status bit

= A word has been received and is waiting to be read by the CPU

= No word has been received

OBF:

Output Buffer Full Status bit

= The output buffer still holds a previously written word

= The output buffer has been read

IBOV:

Input Buffer Overflow Detect bit (in microprocessor mode)

= A write occurred when a previously input word has not been read (must be cleared in software)

= No overflow occurred

PSPMODE:

Parallel Slave Port Mode Select bit

= Parallel slave port mode

= General purpose I/O mode

Unimplemented:

Read as 鈥?鈥?/div>

bit 6:

bit 5:

bit 4:

bit 3:

bit 2:

PORTE Data Direction Bits

Bit2:

Direction Control bit for pin RE2/CS/AN7

= Input

= Output

Bit1:

Direction Control bit for pin RE1/WR/AN6

= Input

= Output

Bit0:

Direction Control bit for pin RE0/RD/AN5

= Input

= Output

bit 1:

bit 0:

DS30292B-page 36

漏

1999 Microchip Technology Inc.

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