PIC16F913 datasheet(67/272 Pages) MICROCHIP

67 / 272 page

Preliminary

DS41250E-page 65

PIC16F917/916/914/913

3.6

PORTE and TRISE Registers

PORTE is a 4-bit port with Schmitt Trigger input buffers.

RE<2:0> are individually configured as inputs or out-

puts. RE3 is only available as an input if MCLRE is ‘0’

in Configuration Word (Register 16-1).

RE<2:0> are only available on the PIC16F914 and

PIC16F917.

EXAMPLE 3-5:

INITIALIZING PORTE

PORTE – PORTE REGISTER (ADDRESS: 09h)

TRISE – PORTE TRI-STATE REGISTER (ADDRESS: 89h)

Note:

Analog lines that carry LCD signals

(i.e., SEGx, where x are segment identifi-

ers) are shown as direct connections to

the device pins. The signals are outputs

from the LCD module and may be

tri-stated, depending on the configuration

of the LCD module.

BCF

STATUS,RP0

;Bank 0

BCF

STATUS,RP1

;

CLRF

PORTE

;Init PORTE

BSF

STATUS,RP0

;Bank 1

BCF

STATUS,RP1

;

MOVLW

0Fh

;Set RE<3:0> as inputs

MOVWF

TRISE

;

CLRF

ANSEL

;Make RE<2:0> as I/O’s

BCF

STATUS,RP0

;Bank 0

BCF

STATUS,RP1

;

U-0

R/W-x

—

RE3

RE2

RE1

RE0

bit 7

bit 0

bit 7-4

Unimplemented: Read as ‘0’

bit 3-0

RE<3:0>: PORTE I/O Pin bits

= Port pin is >VIH

= Port pin is <VIL

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

U-0

R-1

R/W-1

—

TRISE3

TRISE2

TRISE1

TRISE0

bit 7

bit 0

bit 7-4

Unimplemented: Read as ‘0’

bit 3

TRISE3: Data Direction bit. RE3 is always an input, so this bit always reads as a ‘1’

bit 2-0

TRISE<2:0>: Data Direction bits

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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