PCA2117DUGSSLASHDA datasheet(15/107 Pages) NXP

15 / 107 page

PCA2117

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Product data sheet

Rev. 4 — 8 April 2015

15 of 107

NXP Semiconductors

PCA2117

Automotive LCD driver for character displays

8.1.1.11

Command: Read_data

The Read_data command reads binary 8-bit data from the CGRAM, CGROM, DDRAM or

ICON-RAM.

The Sel_mem_bank command (see Section 8.1.1.9) determines whether to read from the

CGRAM, CGROM, DDRAM, or ICON-RAM. After reading, the address counter

automatically increments or decrements by 1 in accordance with the setting of bit I_D of

the Entry_mode_set command (see Section 8.1.2.3).

Only bit 4 to bit 0 of the CGRAM or ICON-RAM data are valid. Bit 7 to bit 5 are set logic 0.

8.1.1.12

Command: Write_data

The Write_data command writes binary 8-bit data to the CGRAM, DDRAM or ICON-RAM.

The Sel_mem_bank command determines whether to write data into the CGRAM,

DDRAM or ICON-RAM. After writing, the address counter automatically increments or

decrements by 1 in accordance with the setting of bit I_D of the Entry_mode_set

command (see Section 8.1.2.3).

Only bit 4 to bit 0 of the CGRAM or ICON-RAM data are valid. Bit 7 to bit 5 are not

implemented and should always be logic 0. The cursor and the character blink have to be

turned off when writing to the CGRAM (see Table 25 on page 20).

• The ICON-RAM to display mapping is given in Section 8.5.5 “ICON-RAM”.

• The DDRAM to display mapping is given in Section 8.5.6 “DDRAM”.

Table 16.

Read_data - data read bit description

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

DDRAM and CGROM

7 to 0

RD[7:0]

00000000 to

11111111

read data from DDRAM and CGROM

CGRAM and ICON-RAM

7 to 5

000

fixed value

4 to 0

RD[4:0]

00000 to

11111

read data from CGRAM and ICON-RAM

Table 17.

Write_data - data write bit description

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

DDRAM

7 to 0

WD[7:0]

00000000 to

11111111

write data to DDRAM

CGRAM and ICON-RAM

7 to 5

000

not implemented

4 to 0

WD[4:0]

00000 to

11111

write data to CGRAM and ICON-RAM

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