PCA2117DUGSSLASHDA datasheet(16/107 Pages) NXP

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PCA2117

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Product data sheet

Rev. 4 — 8 April 2015

16 of 107

NXP Semiconductors

PCA2117

Automotive LCD driver for character displays

8.1.2 Display control commands

8.1.2.1

Command: Clear_display

The Clear_display command clears the entire display.

Clear_display: Writes the character code 20h (blank pattern) into all DDRAM addresses

except for the character set ‘R’ where the character code 20h is not a blank pattern.

When using character set ‘R’, use the following alternative instruction:

1. Switch off display (Display_control, bit D = 0).

2. Write a blank pattern into all DDRAM addresses (Write_data).

3. Switch on display (Display_control, bit D = 1).

The address counter remains on the previously accessed pointer, bit I_D keeps the

previously programmed value.

8.1.2.2

Command: Return_home

The Return_home command sets the cursor to the left top corner of the display.

Return_home: Sets the address counter to logic 0 and switches a shifted display back to

an unshifted state. The DDRAM content remains unchanged. The cursor or blink position

goes to the left of the first display line. Bit I_D and bit S of the Entry_mode_set instruction

remain unchanged. If no other command follows, this command must be terminated with

the Register_update command.

Table 18.

Clear_display - clear display bit description

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

7 to 0

00000000

clear display

Table 19.

Return_home - return home bit description

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

7 to 0

00000001

return home

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