參數(shù)資料
型號： HD66728
廠商： Hitachi,Ltd.
英文描述： 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點圖形LCD控制器)
中文描述： 112 × 80點圖形LCD控制器/驅(qū)動器（112 × 80點圖形液晶顯示控制器）
文件頁數(shù)： 67/138頁
文件大?。?/td> 2158K
代理商： HD66728
HD66728
67
Key Scan Interrupt (Wake-up Function)
If the interrupt enable bit (IRE) is set to 1, the HD66728 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 HD66728 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 HD66728 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) or in the key standby mode (KSB = 1). During this period, the KST0 output is kept low, so the HD66728
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 HD66728 can always monitor 32 key inputs. If any of 32 keys is pressed, an interrupt occurs.
Accordingly, power consumption or noise generation 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
HD66728 detects a key input from the above keys. For details, see the Standby Mode section.
The IRQ* output pin is pulled up to 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
HD66728
IRQ*
Vcc
MPU
Figure 34 Interrupt Generator
相關(guān)PDF資料
PDF描述
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
HD66731A00TA0L Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HD66731A01TA0L 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
HD66729 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
HD66730 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
HD66730A00FS 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
HD66730A01FS 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
HD66731 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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