PCF8545ATT datasheet(24/103 Pages) NXP

24 / 103 page

PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

24 of 103

NXP Semiconductors

PCA8530

Automotive 102 x 4 Chip-On-Glass LCD segment driver

8.7 Display RAM commands

8.7.1 Command: Write-display-data

The Write-display-data command writes data byte-wise to the RAM. After Power-On

Reset (POR), the RAM content is random and should be brought to a defined status by

clearing it (setting it logic 0).

More information about the display RAM can be found in Section 8.14 on page 51.

8.7.2 Bank select commands

For multiplex drive modes 1:2, and static drive mode, it is possible to write data to one

area of the RAM while displaying from another. These areas are named as RAM banks.

Input and output banks can be set independently from one another with the

Input-bank-select and the Output-bank-select command. More information about RAM

bank switching can be found in Section 8.14.3 on page 53.

8.7.2.1

Command: Input-bank-select

Table 25.

Write-display-data - write display data command bit description

For this command, the register selection bits have to be set RS[1:0] = 01.

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

7 to 0

DB[7:0]

00000000 to

11111111

writing data byte-wise to RAM

Table 26.

Input-bank-select - input bank select command bit description

This command is not applicable for multiplex drive mode 1:4.

Bit

Symbol

Value

Description

-R/W

fixed value

RS[1:0]

fixed value

7 to 2

000010

fixed value

1 to 0

IB[1:0]

selects RAM bank to write to

static drive mode

1:2 drive mode

bank 0: RAM-row 0

bank 0: RAM-rows 0

and 1

bank 1: RAM-row 1

bank 2: RAM-row 2

bank 2: RAM-rows 2

and 3

bank 3: RAM-row 3

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