參數(shù)資料
型號(hào): HD66728
廠商: Hitachi,Ltd.
英文描述: 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點(diǎn)圖形LCD控制器)
中文描述: 112 × 80點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器(112 × 80點(diǎn)圖形液晶顯示控制器)
文件頁數(shù): 119/138頁
文件大小: 2158K
代理商: HD66728
HD66728
119
Standby Mode
Setting the standby mode bit (STB) to 1 puts the HD66728 in the standby mode, where the device stops
completely, halting all internal operations including the R-C oscillation circuit, thus further reducing
current consumption compared to that in the sleep mode. Specifically, character and segment displays,
which are controlled by the multiplexing drive method, are completely halted. Here, all the SEG (SEG1 to
SEG112) and COM (COM1 to COM80) pins output the GND level, resulting in no display. If the AMP bit
is set to 0 in the standby mode, the LCD drive power supply can be turned off.
During the standby mode, no instructions can be accepted other than the start-oscillation instruction and the
key scan interrupt generation enable instruction. To cancel the standby mode, issue the start-oscillation
instruction to stabilize R-C oscillation before setting the STB bit to 0.
Although key scan is halted in the standby mode, the HD66728 can detect key inputs, thus generating key
scan interrupt (IRQ*). This means, the system can be activated from a completely inactive state. For
details, see the Key Scan Interrupt (Wake-up Function) section.
Set standby mode: STB = 1
Standby mode (Key scan interrupt enabled)
Issue the start-oscillation instruction
Wait at least 10 ms
Cancel standby mode: STB = 0
Turn on the LCD drive power supply: AMP = 1
Turn off the LCD power supply: AMP = 0
Figure 68 Procedure for Setting and Canceling Standby Mode
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