Mikroelektronika MikroE Development Kits MIKROE-997 Data Sheet

© 2009 Microchip Technology Inc.

DS39775C-page 155

PORTF is a 6-bit wide, bidirectional port. RF2, RF5 and
RF6 are analog inputs. These ports are configured as
analog inputs on a device Reset.
All pins on PORTF are implemented with Schmitt Trig-
ger input buffers. Each pin is individually configurable
as an input or output.
Pins, RF3 and RF4, are multiplexed with the USB mod-
ule. Depending on the configuration of the module, they
can serve as the differential data lines for the on-chip
USB transceiver. Both RF3 and RF4 have Schmitt
Trigger input buffers. As digital ports, they can only
function as digital inputs; the on-chip USB transceiver
must be disabled (UTRDIS (UCFG<3>) bit = 1) to use
the pin as digital inputs. When configured for USB oper-
ation, the data direction is determined automatically by
the configuration and status of the USB module at any
given time. 

When Configuration bit, PMPMX = 0, PORTF is multi-
plexed with Parallel Master data port. This multiplexing
is available only in 80 pin devices.

Note 1: On device Resets, pins RF2, RF5 and

RF6 are configured as analog inputs and
are read as ‘0’.

2: To configure PORTF as digital I/O, set the

corresponding bits in ANCON0 and
ANCON1.

CLRF

PORTF 

; Initialize PORTF by
; clearing output
; data latches

CLRF

LATF 

; Alternate method to

 

; clear output latches

BSF

WDTCON,ADSHR ; Enable write/read to

; the shared SFR

MOVLW

80h 

; make RF2 digital

MOVWF

ANCON0

;

MOVLW

0Ch 

; make RF<6:5> digital

MOVWF

ANCON1

;

BCF

WDTCON,ADSHR ; Disable write/read to

; the shared SFR

MOVLW

C0h ;

MOVWF

TRISF 

; Set RF5:RF2 as outputs,
; RF<7:6> as inputs