PIC16C925-SSLASHCL datasheet(40/182 Pages) MICROCHIP

40 / 182 page

PIC16C925/926

DS39544A-page 38

Preliminary

 2001 Microchip Technology Inc.

4.7

PORTG and TRISG Register

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

plexed with an LCD segment driver. These pins have

Schmitt Trigger input buffers.

EXAMPLE 4-7:

INITIALIZING PORTG

FIGURE 4-9:

PORTG BLOCK DIAGRAM

TABLE 4-13:

PORTG FUNCTIONS

TABLE 4-14:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTG

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,

SE27

;Make all PORTG

BCF

LCDSE,

SE20

;and PORTE<7>

;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

RG0/SEG20

bit0

Digital input or Segment Driver20.

RG1/SEG21

bit1

Digital input or Segment Driver21.

RG2/SEG22

bit2

Digital input or Segment Driver22.

RG3/SEG23

bit3

Digital input or Segment Driver23.

RG4/SEG24

bit4

Digital input or Segment Driver24.

RG5/SEG25

bit5

Digital input or Segment Driver25.

RG6/SEG26

bit6

Digital input or Segment Driver26.

RG7/SEG28

bit7

Digital input or Segment Driver28 (not available on 64-pin devices).

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

108h

PORTG

RG7

RG6

RG5

RG4

RG3

RG2

RG1

RG0

0000 0000

188h

TRISG

PORTG 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 PORTG.

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