參數(shù)資料
型號： HCD66727A04
廠商： Hitachi,Ltd.
英文描述： Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function
中文描述： 低功耗點(diǎn)陣液晶顯示控制器/鍵掃描功能驅(qū)動程序
文件頁數(shù)： 85/97頁
文件大?。?/td> 513K
代理商： HCD66727A04
HD66727
85
Sleep Mode
Setting the sleep mode bit (SLP) to 1 puts the HD66727 in the sleep mode, where the device halts all the
internal display operations except for annunciator display and key scan operations, thus reducing current
consumption. 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 sleep mode, the LCD drive
power supply can be turned off, reducing the total current consumption of the LCD module.
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
相關(guān)PDF資料
PDF描述
HCD66727A04BP Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function
HCD66730A00 Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HCD66730A01 Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HCD66731A00BP Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HCD66731A01BP Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HCD66727A04BP 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function
HCD66730A00 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HCD66730A01 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HCD66731A00BP 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HCD66731A01BP 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
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