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參數(shù)資料
| 型號(hào)： | HD66421 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
| 中文描述： | （內(nèi)存提供160通道4級(jí)灰度的點(diǎn)陣圖形液晶顯示驅(qū)動(dòng)程序） |
| 文件頁(yè)數(shù)： | 30/46頁(yè) |
| 文件大?。?/td> | 201K |
| 代理商： | HD66421 |
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Preliminary
Rev. 1.1E '99.02.10
HD66421
COM1-COM100
SEG1-SEG160
Display starts
Initiation
Cancellation
Figure 27 Procedure for Initiation and Canceling a Standby Mode
Wait for oscillation and external
power supply to stabilize
Set DISP bit to 1 (control register 1)
STBY
1
0
1
0
Output VLCD (display off)
Output common signals (VLCD - GND)
Output VLCD (display off)
Output segment signals (VLCD - GND)
Signal Name
Status
Table 7 Output Pin Status during Power Down modes
Power Down Modes
The HD66421 has a standby function providing
low power-dissipation, which is initiated by
internal register settings. During standby mode,
all the HD66421 functions are inactive and data
in the display RAM and internal registers except
the DISP bit are retained. However, only control
registers can be accessed during standby mode.
HD66421 has an another power down mode:
partial display. In this mode only a part of display
is active. However, this duty ratio is 1/8 so the
external power supply for LCD drive will be
inactive. The oscillator does not halt, thus
dissipating more power than standby mode. Table
6 lists the LCD driver output pin status during
standby mode. Figure 27 shows the procedure for
initiating and canceling a standby mode and
figure 28 shows the procedure for changing
oscillator. Note that these procedure must be
strictly followed to protect data in the display
RAM.
Set HOLT bit to 1 (control register 1)
Set DTY or GRAY bit to 1 (control register 2)
Internal operation stops
Oscillator 2 starts working
Figure 28 Procedure for Changing Oscillator
Wait for oscillation to stabilize
Clear HOLT bit to 0 (control register 1)
Internal operation starts
30
Set STBY bit to 1 and AMP bit to 0
(control register 1)
Clear STBY and PWR bits to 0 and AMP bit to 1
(control register 1)
Oscillator starts
OP amp power on
Internal operation starts
Standby mode
Oscillation halts
OP amp power off
External power supply off
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| HD66421TB0 | (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66421TB0 | 制造商:Renesas Electronics Corporation 功能描述: |
| HD66503 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66520 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66520T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66520TA0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
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