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參數(shù)資料
| 型號： | HD66726 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Graphics LCD 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： | 圖形液晶顯示控制器/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)： | 59/117頁 |
| 文件大?。?/td> | 1549K |
| 代理商： | HD66726 |
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HD66726
59
Key Scan Interrupt (Wake-up Function)
If the interrupt enable bit (IRE) is set to 1, the HD66726 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 while the key is being pressed.
Normal key scanning is performed and interrupts can occur in the HD66726 sleep mode (SLP = 1).
Accordingly, power consumption can be minimized in the sleep mode, by triggering the MPU to read key
states via the interrupt which is generated only when the HD66726 detects a key input. For details, see the
Sleep Mode section.
On the other hand, normal key scanning and the internal operating clock stop in the standby mode (STB =
1). During this period, the KST0 output is kept low, so the HD66726 can always monitor eight key inputs
(KIN0-KIN7) connected to KST0 when RS = GND. Therefore, if any of the eight keys is pressed, an
interrupt occurs. When RS = Vcc, all outputs KST0 to KST3 are kept low, so the HD66726 can always
monitor 32 key inputs. If any of 32 keys is pressed, an interrupt occurs. Accordingly, power consumption
can further be minimized in the standby mode, where the whole system is inactive, by triggering the MPU
via the interrupt which is generated only when the HD66726 detects a key input from the above keys. For
details, see 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 KIN0-KIN7 input during key scanning. Interrupts must be inhibited if not needed by setting the
interrupt enable bit (IRE) to 0.
IRQ*
Interrupt generated
HD66726
IRQ*
Vcc
MPU
Figure 30 Interrupt Generator
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66727 | 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) |
| HD66728 | 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點圖形LCD控制器) |
| HD66730 | Dot-Matrix Liquid Crystal Display Controller/Driver(點陣液晶顯示控制器/驅(qū)動器) |
| HD66731 | Dot-Matrix Liquid Crystal Display Controller/Driver(點陣液晶顯示控制器/驅(qū)動器) |
| HD66731A00TB0L | 122 x 32 pixel format, Compact LCD size |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66726A03TB0L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| HD66727 | 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 |
| HD66727A03 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66727A03BP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66727A03TA0 | 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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