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參數(shù)資料
| 型號(hào)： | PCF8562 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Universal LCD driver for low multiplex rates |
| 中文描述： | 通用LCD驅(qū)動(dòng)器的低復(fù)用率 |
| 文件頁數(shù)： | 17/36頁 |
| 文件大?。?/td> | 928K |
| 代理商： | PCF8562 |
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November 22, 2004
17
Philips Semiconductors
Preliminary specification
Universal LCD driver
for low multiplex rates
PCF8562
The PCF8562 includes a RAM bank switching feature in the static and 1 : 2 drive modes. In the static drive mode, the
BANK SELECT command may request the contents of bit 2 to be selected for display instead of the contents of bit 0. In
1 : 2 mode, the contents of bits 2 and 3 may be selected instead of bits 0 and 1. This allows display information to be
prepared in an alternative bank and then selected for display when it is assembled.
6.14
Input bank selector
The input bank selector loads display data into the display RAM in accordance with the selected LCD drive configuration.
The BANK SELECT command can be used to load display data in bit 2 in static drive mode or in bits 2 and 3 in
1 : 2 mode. The input bank selector functions are independent of the output bank selector.
6.15
Blinker
The PCF8562 has a very versatile display blinking capability. The whole display can blink at a frequency selected by the
BLINK command. Each blink frequency is a multiple integer value of the clock frequency; the ratio between the clock
frequency and blink frequency depends on the blink mode selected, as shown in Table 3.
An additional feature allows an arbitrary selection of LCD segments to be blinked in the static and 1 : 2 drive modes.
This is implemented without any communication overheads by the output bank selector which alternates the displayed
data between the data in the display RAM bank and the data in an alternative RAM bank at the blink frequency. This
mode can also be implemented by the BLINK command.
In the 1 : 3 and 1 : 4 drive modes, where no alternative RAM bank is available, groups of LCD segments can be blinked
by selectively changing the display RAM data at fixed time intervals.
The entire display can be blinked at a frequency other than the nominal blink frequency by sequentially resetting and
setting the display enable bit E at the required rate using the MODE SET command.
Table 3
Blinking frequencies
Note
1.
Blink modes 0.5, 1 and 2 Hz, and nominal blink frequencies 0.5, 1 and 2 Hz correspond to an oscillator frequency
(f
CLK
) of 1536 Hz at pin CLK. The oscillator frequency range is given in Chapter 11.
BLINK MODE
NORMAL OPERATING MODE
RATIO
NOMINAL BLINK FREQUENCY
Off
2 Hz
blinking off
2 Hz
1 Hz
1 Hz
0.5 Hz
0.5 Hz
f
768
f
1536
f
3072
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| PCF8562_09 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates |
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