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NXP Semiconductors
PCA85132
LCD driver for low multiplex rates
? In 1:4 multiplex mode, all RAM addresses of row 0 are selected, followed by the
contents of row 1, row 2, and then row 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
7.5.4.2
7.5.4.3
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 by using the bank-select
command (see Table 10 ). The input bank selector functions independently to the output
bank selector.
RAM bank switching
The PCA85132 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 14 ). 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 14. RAM banks in static and multiplex driving mode 1:2
There are two banks; bank 0 and bank 1. Figure 14 shows the location of these banks
relative to the RAM map. Input and output banks can be set independently from one
another with the Bank-select command (see Table 10 on page 8 ). Figure 15 shows the
concept.
PCA85132
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 11 July 2013
? NXP B.V. 2013. All rights reserved.
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