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(diǎn)圖形LCD控制器)
中文描述: 112 × 80點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器(112 × 80點(diǎn)圖形液晶顯示控制器)
文件頁數(shù): 50/138頁
文件大?。?/td> 2158K
代理商: HD66728
HD66728
50
Key Scan Control
IRE:
When SW = 0 and IRE = 1, it permits interrupts when a key is pressed. This causes interrupts to
occur in the standby period when the oscillator clock is halted, as well as key scan interrupts during normal
operation, allowing system wake-up.
KF1-0:
Set the key scan cycle when SW = 0. The following table shows the key scan pulse width and key
scan cycle used when the oscillation frequency (fosc) is 80 kHz, which depend on the oscillation frequency.
For details, see the Key Scan Control section.
KSB:
When SW = 1 and KSB = 1, the KSB enters the key standby mode to stop key scanning. In this
case, as well as in the standby mode, key scan interrupts can be generated. When KSB = 0, keys are
scanned normally.
R/W RS DB7
DB0
0
0
DB6 DB5 DB4 DB3 DB2 DB1
0
1
1
0
1
KF1 KF0
<0> <0>
IRE
KSB
(SW = 0)
(SW = 1)
Figure 22 Key Scan Control Instruction
Table 20
KF Bits and Key Scan Cycle
KF1
KF0
Key Scan Pulse Width
Key Scan Cycle
0
0
0.2 ms (16 clocks)
0.8 ms (64 clocks)
0
1
0.4 ms (32 clocks)
1.6 ms (128 clocks)
1
0
0.8 ms (64 clocks)
3.2 ms (256 clock cycles)
1
Note:
1
1.6 ms (128 clocks)
6.4 ms (512 clock cycles)
The data is a value obtained when the oscillation frequency (fosc) is 80 kHz. The value depends on
the oscillation frequency.
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