PIC17C752 datasheet(84/306 Pages) MICROCHIP

84 / 306 page

PIC17C7XX

DS30289C-page 84

 1998-2013 Microchip Technology Inc.

10.6

PORTF and DDRF Registers

PORTF is an 8-bit wide bi-directional port. The corre-

sponding data direction register is DDRF. A '1' in DDRF

configures the corresponding port pin as an input. A '0'

in the DDRF register configures the corresponding port

pin as an output. Reading PORTF reads the status of

the pins, whereas writing to PORTF will write to the

respective port latch.

All eight bits of PORTF are multiplexed with 8 channels

of the 10-bit A/D converter.

Upon RESET, the entire Port is automatically config-

ured as analog inputs and must be configured in soft-

ware to be a digital I/O.

Example 10-6 shows an instruction sequence to initial-

ize PORTF. The Bank Select Register (BSR) must be

selected to Bank 5 for the port to be initialized. The fol-

lowing example uses the MOVLB instruction to load the

BSR register for bank selection.

EXAMPLE 10-6:

INITIALIZING PORTF

FIGURE 10-13:

BLOCK DIAGRAM OF RF7:RF0

MOVLB

; Select Bank 5

MOVWF

0x0E

; Configure PORTF as

MOVWF

ADCON1

; Digital

CLRF

PORTF, F

; Initialize PORTF data

;

latches before

;

the data direction

;

MOVLW

0x03

; Value used to init

;

data direction

MOVWF

DDRF

; Set RF<1:0> as inputs

;

RF<7:2> as outputs

Data Bus

WR PORTF

WR DDRF

RD PORTF

Data Latch

DDRF Latch

VSS

I/O pin

PCFG3:PCFG0

Input

Buffer

VDD

RD DDRF

To other pads

VAIN

CHS3:CHS0

To other pads

Note: I/O pins have protection diodes to VDD and VSS.

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