PCA85162 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 4 — 9 April 2015 25 of 56
NXP Semiconductors
PCA85162
32 x 4 automotive LCD driver for low multiplex rates
7.6.5 Bank selection
7.6.5.1 Output bank selector
The output bank selector (see Table 10
) 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
The PCA85162 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.
7.6.5.2 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 10
). The input bank selector functions independently to the output bank selector.
7.6.5.3 RAM bank switching
The PCA85162 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 13
). 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.
