PCA9620 datasheet(47/71 Pages) NXP

47 / 71 page

PCA9620

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Product data sheet

Rev. 1 — 9 December 2010

47 of 71

NXP Semiconductors

PCA9620

Universal LCD driver for low multiplex rates

In Figure 41 an example is shown for 1:4 multiplex drive mode where the displayed data is

read from the first four rows of the memory (bank 0), while the transmitted data is stored in

the second four rows of the memory (bank 4) which is currently not accessed for the

reading. Therefore different content can be loaded into the first and second four RAM

rows which will be immediately displayed on the LCD by switching it with the

output-bank-select command (see Figure 42).

7.9.2.1

Input-bank-select

The input-bank-select command (see Table 18 on page 10) loads display data into the

display RAM in accordance with the selected LCD drive configuration.

• In static drive mode, an individual content can be stored in each RAM bank (bank 0 to

bank 7 which corresponds to row 0 to row 7).

• In 1:2 multiplex drive mode, individual content for RAM bank 0 (row 0 and row 1),

RAM bank 2 (row 2 and row 3), RAM bank 4 (row 4 and 5) and RAM bank 6 (row 6

and row 7) can be stored.

• In 1:4 multiplex drive mode individual content can be stored in RAM bank 0 (row 0 to

row 3) and RAM bank 4 (row 4 to row 7).

The input-bank-select command works independently to the output-bank-select.

Fig 41. Example of bank selection in 1:4 multiplex mode

Fig 42. Example of the input-bank-select and the output-bank-select command with

multiplex drive mode 1:4

MICROCONTROLLER

DISPLAY

RAM

BANK 0

BANK 4

013aaa422

INPUT-BANK-SELECT COMMAND

CONTROLS THE INPUT DATA PATH

OUTPUT-BANK-SELECT COMMAND

CONTROLS THE OUTPUT DATA PATH

display RAM columns/segment outputs (S)

columns

display RAM rows/

backplane outputs

(BP)

rows

013aaa424

55 56 57 58 59

to the LCD

output RAM bank

input RAM bank

to the RAM

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