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參數(shù)資料
| 型號(hào)： | HD66732 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Graphics Liquid Crystal Display Controller/Driver Supporting JIS Level-1 and Level-2 Kanji ROM(圖形LCD控制器/驅(qū)動(dòng)器) |
| 中文描述： | 圖形液晶顯示控制器/驅(qū)動(dòng)器支持日標(biāo)級(jí)- 1和第2級(jí)漢字光盤（圖形液晶顯示控制器/驅(qū)動(dòng)器） |
| 文件頁數(shù)： | 69/133頁 |
| 文件大?。?/td> | 2608K |
| 代理商： | HD66732 |
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HD66732
69
Key Scan Interrupt (Wake-up Function)
If the interrupt enable bit (IRE) is set to 1, the HD66732 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 HD66732 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 HD66732 detects a key input. For details, see the
Sleep Mode section.
On the other hand, normal key scanning stops in the standby mode (STB = 1) or in the key standby mode
(KSB = 1). During this period, the KST0 output is kept low, so the HD66732 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 HD66732 can always
monitor 32 key inputs. If any of the 32 keys is pressed, an interrupt occurs. Accordingly, power
consumption or noise generation can be further minimized in the standby mode, where the whole system is
inactive, by triggering the MPU via the interrupt which is generated only when the HD66732 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
HD66732
IRQ*
Vcc
MPU
Figure 29 Interrupt Generator
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66740TB0 | 50/MDR/RECP/VERT PRS FIT/M2.6/SCW/30MIN |
| HD66740WTB0 | 112 x 80-dot Graphics LCD Controller/Driver |
| HD66751 | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66750TB0 | 122 x 32 pixel format, Compact LCD size |
| HD66750 | 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66735 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HD66735 Procedure for setting Standby/Sleep/Display off mode. Technical Update/Device |
| HD66740 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD66740TB0 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:112 x 80-dot Graphics LCD Controller/Driver |
| HD66740WTB0 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:112 x 80-dot Graphics LCD Controller/Driver |
| HD66741 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
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