PIC16F722A-I/ML 查看數據表（PDF） - Microchip Technology

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PIC16F722A-I/ML

28-Pin Flash Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC16F/LF722A/723A

6.5 PORTE and TRISE Registers

PORTE(1) is an 1-bit wide, input only port. RE3 is input

only and its TRIS bit will always read as ‘1’.

Reading the PORTE register (Register 6-12) reads the

status of the pins. RE3 reads ‘0’ when MCLRE = 1.

REGISTER 6-12: PORTE: PORTE REGISTER

U-0

—

bit 7

U-0

U-0

U-0

R-x

U-0

—

—

—

RE3

—

U-0

U-0

—

—

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-4

bit 3

bit 2-0

Unimplemented: Read as ‘0’

RE3: PORTE I/O Pin bits(1)

1 = Port pin is > VIH

0 = Port pin is < VIL

Unimplemented: Read as ‘0’

REGISTER 6-13: TRISE: PORTE TRI-STATE REGISTER

U-0

—

bit 7

U-0

U-0

U-0

R-1

U-0

—

—

—

TRISE3

—

U-0

U-0

—

—

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-4

bit 3

bit 2-0

Unimplemented: Read as ‘0’

TRISE3: RE3 Port Tri-state Control bit

This bit is always ‘1’ as RE3 is an input only

Unimplemented: Read as ‘0’

TABLE 6-4: SUMMARY OF REGISTERS ASSOCIATED WITH PORTE

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

PORTE

—

—

—

—

RE3

—

—

—

---- x--- ---- x---

TRISE

—

—

—

— TRISE3(1)

—

—

—

---- 1--- ---- 1---

Legend: x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by PORTE

Note 1: This bit is always ‘1’ as RE3 is input only.

DS41417A-page 74

 2010 Microchip Technology Inc.

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