PCF8545ATT datasheet(13/48 Pages) NXP

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PCE85176AUG

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Product data sheet

Rev. 1 — 12 January 2015

13 of 48

NXP Semiconductors

PCE85176AUG

4 × 40 LCD segment driver for Chip-On-Glass

7.3.4 Bank selection

7.3.4.1

Output bank selector

The output bank selector (see Table 14) selects one of the four rows per display RAM

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

selected 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

The PCE85176AUG includes a RAM bank switching feature in the static and 1:2 multiplex

drive modes. In the static drive mode, the bank-select command may request the contents

of row 2 to be selected for display instead of the contents of row 0. In the 1:2 multiplex

mode, the contents of rows 2 and 3 may be selected instead of rows 0 and 1. This gives

the provision for preparing display information in an alternative bank and to be able to

switch to it once it is assembled.

7.3.4.2

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 14). The input bank selector functions independently to the output bank selector.

7.3.4.3

RAM bank switching

The PCE85176AUG 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 6). 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.

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