PIC18LF66K80-I/PT【PDF 100/351 页】MCU PIC ECAN 64KB FLASH 64TQFP

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Sheet目录3841

96页 97页 98页 99页 [100页]101页 102页 103页 104页

2010-2012 Microchip Technology Inc.

DS39977F-page 189

PIC18F66K80 FAMILY

11.7

PORTF, LATF and TRISF Registers

PORTF is an 8-bit wide, bidirectional port. The

corresponding Data Direction and Output Latch regis-

ters are TRISF and LATF. All pins on PORTF are

implemented with Schmitt Trigger input buffers. Each pin

is individually configurable as an input or output.

Each of the PORTF pins has a weak internal pull-up. A

single control bit can turn off all the pull-ups. This is

done by clearing bit, RFPU (PADCFG1<5>). The weak

pull-up is automatically turned off when the port pin is

configured as an output. The pull-ups are disabled on

any device Reset.

EXAMPLE 11-6:

INITIALIZING PORTF

TABLE 11-12: SUMMARY OF REGISTERS ASSOCIATED WITH PORTF

Note:

PORTF is only available on 64-pin devices.

Note:

On device Resets, pins, RF<7:1>, are

configured as analog inputs and are read

as ‘0’.

CLRF

PORTF

; Initialize PORTF by

; clearing output

; data latches

CLRF

LATF

; Alternate method

; to clear output

; data latches

MOVLW

0CEh

; Value used to

; initialize data

; direction

MOVWF

TRISF

; Set RF3:RF1 as inputs

; RF5:RF4 as outputs

; RF7:RF6 as inputs

TABLE 11-11:

PORTF FUNCTIONS

Pin Name

Function

TRIS

Setting

I/O

I/O Type

Description

RF0/MDMIN

RF0

DIG

LATF<0> data output.

PORTF<0> data input.

MDMIN

Modulator source input.

RF1

DIG

LATF<1> data output.

PORTF<1> data input.

RF2/MDCIN1

RF2

DIG

LATF<2> data output.

PORTF<2> data input.

MDCIN1

Modulator Carrier Input 1.

RF3

DIG

LATF<3> data output.

PORTF<3> data input.

RF4/MDCIN2

RF4

DIG

LATF<4> data output.

PORTF<4> data input.

MDCIN2

Modulator Carrier Input 2.

RF5

DIG

LATF<5> data output.

PORTF<5> data input.

RF6/MDOUT

RF6

DIG

LATF<6> data output.

PORTF<6> data input.

MDOUT

DIG

Modulator output.

RF7

DIG

LATF<7> data output.

PORTF<7> data input.

Legend:

O = Output; I = Input; ANA = Analog Signal; DIG = CMOS Output; ST = Schmitt Trigger Buffer Input;

= Don’t care (TRIS bit does not affect port direction or is overridden for this option)

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PORTF

RF7

RF6

RF5

RF4

RF3

RF2

RF1

RF0

LATF

LATF7

LATF6

LATF5

LATF4

LATF3

LATF2

LATF1

LATF0

TRISF

TRISF7

TRISF6

TRISF5

TRISF4

TRISF3

TRISF2

TRISF1

TRISF0

PADCFG1

RDPU

REPU

RFPU(1)

RGPU(1)

—

CTMUDS

Legend:

— = unimplemented, read as ‘0’. Shaded cells are not used by PORTF.

Note 1:

These bits are unimplemented on 28-pin devices, read as ‘0’.

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