參數(shù)資料
型號： HD66727
廠商： Hitachi,Ltd.
英文描述： Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動器)
中文描述： 低功耗點(diǎn)陣液晶顯示控制器/鍵掃描功能（帶鍵掃描功能的圖形液晶顯示控制器/驅(qū)動器驅(qū)動程序）
文件頁數(shù)： 86/98頁
文件大小： 1576K
代理商： HD66727
HD66727
86
Annunciators can be normally displayed in the sleep mode. Since they are driven at logic operating power
supply voltage (V
CC
– AGND), they are available even if the LCD power supply is turned off (AMP = 0).
This function allows time and alarm marker indication during system standby with reduced current
consumption.
During the sleep mode, no instructions can be accepted for character/segment display and neither DDRAM,
CGRAM, nor SEGRAM can be accessed.
The key scan circuit operates normally in the sleep mode, thus allowing normal key scan and key scan
interrupt generation. All keys can be scanned while only displaying annunciators. For details, refer to the
Key Scan Control section.
Table 38 compares the functions of the sleep mode and standby mode.
Table 38
Comparison of Sleep Mode and Standby Mode
Function
Sleep Mode (SLP = 1)
Standby Mode (STB = 1)
Character display
Turned off
Turned off
Segment display
Turned off
Turned off
Annunciator display
Can be turned on
Can be turned on when an alternating signal
is supplied to the EXM pin
R-C oscillation
Operates normally
Halted
Key scan
Can operate normally
Halted but IRQ* can be generated
Standby Mode
Setting the standby mode bit (STB) to 1 puts the HD66727 in the standby mode, where the device stops
completely, halting all internal operations including the R-C oscillator, 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 SEG60)
and COM (COM1 to COM34) pins output the V
CC
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.
Annunciators can be displayed simply by supplying an approximately 40-Hz alternating signal for the LCD
drive signals to the EXM pin externally. If annunciator display is unnecessary during the standby mode, the
EXM pin must be fixed to the V
CC
or GND level and the annunciator display on bit (DA) set to 0.
During the standby mode, no instructions can be accepted other than those for annunciator display, the
start-oscillator instruction, and the key scan interrupt generation enable instruction. To cancel the standby
mode, issue the start oscillator instruction to stabilize R-C oscillation before setting the STB bit to 0.
Although key scan is halted in the standby mode, the HD66727 can detect four key inputs connected with
strobe signal KST0, thus generating the key scan interrupt (IRQ*). This means, the system can be activated
from the completely inactive state. For details, refer to the Key Scan Control section.
Figure 50 shows the procedure for setting and canceling the standby mode.
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