參數(shù)資料
型號： HCD66727A03BP
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： 低功耗點陣液晶顯示控制器/鍵掃描功能驅(qū)動程序
文件頁數(shù)： 55/97頁
文件大?。?/td> 513K
代理商： HCD66727A03BP
HD66727
55
Key Scan Interrupt (Wake-Up Function)
If the interrupt enable bit (IRE) is set to 1, the HD66727 sends an interrupt signal to the MPU on detecting
that a key has been pressed in the key scan circuit by setting the IRQ* output pin to a low level. An
interrupt signal can be generated by pressing any key in a 32-key matrix. The interrupt level continues to be
output during the key scan cycle in which the key is being pressed. See Figure 29.
Normal key scanning is performed and interrupts can occur in the HD66727 sleep mode (SLP = 1).
Accordingly, power consumption can be minimized in the sleep mode, where only annunciators can be
displayed, by triggering the MPU to read key states via the interrupt generated only when the HD66727
detects a key input from the 32-key matrix. For details, refer to the Sleep Mode section.
On the other hand, normal key scanning and the internal operating clock are halted in the standby mode
(STB = 1). During this period, the KST0 output is kept low, so the HD66727 can always sense four key
inputs D00 to D03, connected with KIN0 to KIN3, respectively. Therefore, if any of the four keys is
pressed in the standby mode, an interrupt occurs. Accordingly, power consumption can be further
minimized in the standby mode, where the whole system is inactive, by triggering the MPU via the
interrupt generated only when the HD66727 detects a key input from the above four keys. Note that the
interrupt generated in the standby mode automatically starts internal R-C oscillation. For details, refer to
the Standby Mode section.
The IRQ* output pin is pulled up to the V
CC
with an internal MOS resistor of approximately 50 k
;
additional external resistors may be required to obtain stronger pull-ups. Interrupts may occur if noise
occurs in KIN input during key scanning. Interrupts must be inhibited if not needed by setting the interrupt
enable bit (IRE) to 0.
Figure 30 shows key scan interrupt processing flow in sleep and standby modes.
IRQ
*
Interrupt generated
HD66727
IRQ
*
V
CC
MPU
Figure 29 Interrupt Generation
相關(guān)PDF資料
PDF描述
HCD66727A04 Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HCD66727A04 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
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
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