PCA85262 datasheet(13/55 Pages) NXP

13 / 55 page

PCA85262

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Product data sheet

Rev. 3 — 12 November 2018

13 of 55

NXP Semiconductors

PCA85262

Automotive 32 x 4 LCD driver for low multiplex rates

6.3.5 Bank selection

6.3.5.1

Output bank selector

The output bank selector (see Table 9) selects one of the four rows per display RAM

address for transfer to the display register. The actual row selected depends on the

particular LCD drive mode in operation and on the instant in the multiplex sequence.

• In 1:4 multiplex mode, all RAM addresses of row 0 are selected, these are followed by

the contents of row 1, 2, and then 3

• In 1:3 multiplex mode, rows 0, 1, and 2 are selected sequentially

• In 1:2 multiplex mode, rows 0 and 1 are selected

• In static mode, row 0 is selected

6.3.5.2

Input bank selector

The input bank selector loads display data into the display RAM in accordance with the

selected LCD drive configuration. Display data can be loaded in row 2 in static drive mode

or in rows 2 and 3 in 1:2 multiplex drive mode by using the bank-select command (see

Table 9). The input bank selector functions independently to the output bank selector.

6.3.5.3

RAM bank switching

The PCA85262 includes a RAM bank switching feature in the static and 1:2 multiplex

drive modes. A bank can be thought of as one RAM row or a collection of RAM rows (see

Figure 5). The RAM bank switching gives the provision for preparing display information in

an alternative bank and to be able to switch to it once it is complete.

Fig 5.

RAM banks in static and multiplex driving mode 1:2

PCA85262 Datasheet(PDF) 13 Page - NXP Semiconductors