PCA85176 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 6 — 7 April 2015 10 of 60
NXP Semiconductors
PCA85176
40 x 4 automotive LCD driver for low multiplex rates
7.1.5 Command: blink-select
The blink-select command allows configuring the blink mode and the blink frequency.
[1] Default value.
[2] Normal blinking is assumed when the LCD multiplex drive modes 1:3 or 1:4 are selected.
[3] Alternate RAM bank blinking does not apply in 1:3 and 1:4 multiplex drive modes.
7.1.5.1 Blinking
The display blinking capabilities of the PCA85176 are very versatile. The whole display
can blink at frequencies selected by the blink-select command (see Table 11
). The blink
frequencies are derived from the clock frequency. The ratio between the clock and blink
frequencies depends on the blink mode selected (see Table 12
).
An additional feature is for an arbitrary selection of LCD segments/elements to blink. This
applies to the static and 1:2 multiplex drive modes and can be implemented without any
communication overheads. By means of the output bank selector, the displayed RAM
banks are exchanged with alternate RAM banks at the blink frequency. This mode can
also be specified by the blink-select command.
In the 1:3 and 1:4 multiplex modes, where no alternative RAM bank is available, groups of
LCD segments/elements can blink by selectively changing the display RAM data at fixed
time intervals.
The entire display can blink at a frequency other than the nominal blink frequency. This
can be effectively performed by resetting and setting the display enable bit E at the
required rate using the mode-set command (see Table 7
).
Table 11. Blink-select command bit description
See Section 7.1.5.1.
Bit Symbol Value Description
7C0, 1see Table 6
6 to 3 - 1110 fixed value
2AB blink mode selection
0
[1]
normal blinking
[2]
1 alternate RAM bank blinking
[3]
1 to 0 BF[1:0] blink frequency selection
00
[1]
off
01 1
10 2
11 3
