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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)： | 25/154頁(yè) |
| 文件大?。?/td> | 1778K |
| 代理商： | M34551E8-XXXFP |
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APPLICATION
2-43
4551 Group User’s Manual
2.6 Power down function
Remarks
Port P0 shares the falling edge detection circuit with
port P1. The key-on wakeup function of port P0 is always
valid. The only key-on wakeup function of the port P1
bit of which the pull-up transistor is turned on is valid.
Set all the port using the key-on wakeup function to “H”
level before going into the power down state.
The timer 2 interrupt request flag (T2F) can be used
only when system returns from the clock operating mode
(POF instruction execution). However, 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 the clock operating mode.
Timer 2 interrupt
request flag
Return condition
Returns by an external falling
edge input (“H”
→“L”).
Returns by timer 2 underflow
and setting T2F flag to “1.”
Table 2.6.2 Return source and return condition
Note: P1 pin has the pull-up transistor which can be turned on/off by software.
(3)
Start condition identification
When system returns from both power down and reset, software is started from address 0 in page
0.
The start condition (warm start or cold start) can be identified by examining the state of the power
down flag (P) with the SNZP instruction. Also, warm start condition (timer 2 or external wakeup
signal) can be identified by the state of the T2F flag. Table 2.6.3 shows the start condition identification,
and Figure 2.6.3 shows the start condition identified example.
Table 2.6.3 Start condition identification
Fig. 2.6.3 Start condition identified example
Return source
Ports P0, P1
External
wakeup
signal
Return condition
External wakeup signal input
Timer 2 interrupt request flag
Reset
P flag
1
0
T2F flag
1
0
Software start
P = “1”
T2F = “1”
?
No
Yes
Return by external
wakeup signal
Return by timer 2
underflow
Cold start
No
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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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