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參數(shù)資料
| 型號(hào)： | M34551E8-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48 |
| 文件頁(yè)數(shù)： | 27/154頁(yè) |
| 文件大小： | 1778K |
| 代理商： | M34551E8-XXXFP |
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APPLICATION
2-45
4551 Group User’s Manual
2.6 Power down function
2.6.4 Power down function application example
(1)
Clock display
A clock which is high-accuracy and low-power dissipation can be set up by using a 32.768 kHz
quartz-crystal as a sub-clock and executing the POF instruction.
Outline: The power dissipation can be reduced by using the POF instruction.
Specifications: Time is displayed by the LCD and a 32.768 kHz quartz-crystal oscillator. The main
routine is executed by key input.
Figure 2.6.4 shows the software setting example.
Fig. 2.6.4 Software setting example
Software start
Address 0 in page 0
Initialization of register Z
Yes
No
P = “1” ?
Warm start initiai setting
Cold start initial setting
T2F = “1” ?
Yes
No
Clock counter + 1
Time display renewed
Yes
No
Key input ?
Main routine initial setting
DI
EPOF
POF
To main routine
2.6.5 Notes on use
(1)
Key-on wakeup function
After setting ports (P1 specified with register PU0 and P0) which key-on wakeup function is valid to
“H,” execute the POF or POF2 instruction.
“L” level is input to the falling edge detection circuit even if one of ports which key-on wakeup
function is valid is in the “L” level state, and the edge is not detected.
(2)
Power down instruction
Execute the POF or POF2 instruction immediately after executing the EPOF instruction to enter the
power down state.
Note that system cannot enter the power down state when executing only the POF or POF2 instruction.
Be sure to disable interrupts by executing the DI instruction before executing the EPOF instruction.
(3)
POF2 instruction
If the POF and POF2 instructions are executed while the T2F flag = “1,” its operation is recognized
as the return condition and system returns from power down state.
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相關(guān)代理商/技術(shù)參數(shù) |
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| M34551M4 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:4-BIT SINGLE-CHIP MICROCOMPUTER |
| M34551M4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER |
| M34551M8 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:4-BIT SINGLE-CHIP MICROCOMPUTER |
| M34552G8FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34552G8HFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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