PIC16C925-SSLASHCL datasheet(39/182 Pages) MICROCHIP

39 / 182 page

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 37

PIC16C925/926

4.6

PORTF and TRISF Register

PORTF is a digital input only port. Each pin is multi-

plexed with an LCD segment driver. These pins have

Schmitt Trigger input buffers.

EXAMPLE 4-6:

INITIALIZING PORTF

FIGURE 4-8:

PORTF BLOCK DIAGRAM

TABLE 4-11:

PORTF FUNCTIONS

TABLE 4-12:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTF

Note 1: On a Power-on Reset, these pins are

configured as LCD segment drivers.

2: To configure the pins as a digital port, the

corresponding bits in the LCDSE register

must be cleared. Any bit set in the LCDSE

corresponding TRIS register.

BCF STATUS,

RP0

;Select Bank2

BSF STATUS,

RP1

;

BCF LCDSE,

SE16

;Make all PORTF

BCF LCDSE,

SE12

;digital inputs

RD Port

Schmitt

Trigger

Input

Buffer

Digital Input/

LCDSE<n>

LCD

LCD Segment

LCD Output pin

LCD

LCD Common

Data Bus

RD TRIS

VDD

Segment Data

Output Enable

Common Data

Output Enable

Name

Bit#

Buffer Type

Function

RF0/SEG12

bit0

Digital input or Segment Driver12.

RF1/SEG13

bit1

Digital input or Segment Driver13.

RF2/SEG14

bit2

Digital input or Segment Driver14.

RF3/SEG15

bit3

Digital input or Segment Driver15.

RF4/SEG16

bit4

Digital input or Segment Driver16.

RF5/SEG17

bit5

Digital input or Segment Driver17.

RF6/SEG18

bit6

Digital input or Segment Driver18.

RF7/SEG19

bit7

Digital input or Segment Driver19.

Legend: ST = Schmitt Trigger input

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

Power-on

Reset

Value on all

other

RESETS

107h

PORTF

RF7

RF6

RF5

RF4

RF3

RF2

RF1

RF0

0000 0000

187h

TRISF

PORTF Data Direction Control Register

1111 1111

10Dh

LCDSE

SE29

SE27

SE20

SE16

SE12

SE9

SE5

SE0

1111 1111

Legend: Shaded cells are not used by PORTF.

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