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參數(shù)資料
| 型號(hào)： | M34556M8-XXXFP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁(yè)數(shù)： | 114/147頁(yè) |
| 文件大?。?/td> | 1087K |
| 代理商： | M34556M8-XXXFP |
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Rev.3.02
Dec 22, 2006
page 67 of 142
REJ03B0025-0302
4556 Group
POF and POF2 instructions
When the POF or POF2 instruction is executed continuously af-
ter the EPOF instruction, system enters the power down state.
Note that system cannot enter the power down state when ex-
ecuting only the POF or POF2 instruction.
Be sure to disable interrupts by executing the DI instruction be-
fore executing the EPOF instruction and the POF or POF2
instruction continuously.
Power-on reset
When the built-in power-on reset circuit is used, set the time for
the supply voltage to rise from 0 V to the minimum voltage of rec-
ommended operating conditions to 100
s or less.
If the rising time exceeds 100
s, connect a capacitor between
the RESET pin and VSS at the shortest distance, and input “L”
level to RESET pin until the value of supply voltage reaches the
minimum operating voltage.
Voltage drop detection circuit (only in H version)
The voltage drop detection circuit detection voltage of this prod-
uct is set up lower than the minimum value of the supply voltage
of the recommended operating conditions.
When the supply voltage of a microcomputer falls below to the
minimum value of recommended operating conditions and re-
goes up (ex. battery exchange of an application product),
depending on the capacity value of the bypass capacitor added
to the power supply pin, the following case may cause program
failure (Figure 67);
supply voltage does not fall below to VRST-, and
its voltage re-goes up with no reset.
In such a case, please design a system which supply voltage is
once reduced below to VRST- and re-goes up after that.
19
20
21
Clock control
Execute the CRCK instruction in the initial setting routine of pro-
gram (executing it in address 0 in page 0 is recommended).
The oscillation circuit by the CRCK instruction can be selected
only once.
On-chip oscillator
The clock frequency of the on-chip oscillator depends on the sup-
ply voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
Also, the oscillation stabilize wait time after system is released
from reset is generated by the on-chip oscillator clock. When
considering the oscillation stabilize wait time after system is re-
leased from reset, be careful that the variable frequency of the
on-chip oscillator clock.
External clock
When the external signal clock is used as the source oscillation
(f(XIN)), note that the power down mode (POF and POF2 instruc-
tions) cannot be used.
Difference between Mask ROM version and One Time PROM version
Mask ROM version and One Time PROM version have some dif-
ference of the following characteristics within the limits of an
electrical property by difference of a manufacture process, built-
in ROM, and a layout pattern.
a characteristic value
a margin of operation
the amount of noise-proof
noise radiation, etc.,
Accordingly, be careful of them when swithcing.
26
Note on Power Source Voltage
When the power source voltage value of a microcomputer is less
than the value which is indicated as the recommended operating
conditions, the microcomputer does not operate normally and
may perform unstable operation.
In a system where the power source voltage drops slowly when
the power source voltage drops or the power supply is turned off,
reset a microcomputer when the supply voltage is less than the
recommended operating conditions and design a system not to
cause errors to the system by this unstable operation.
23
24
25
VDD
Recommended
operatng condition
min.value
No reset
Program failure may occur.
VRST
+
VRST
–
VDD
Recommended
operatng condition
min.value
VRST
+
VRST
–
→ Normal operation
Reset
Fig. 67 VDD and VRST–
22
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34556MXH-XXXFP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556MX-XXXFP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34559G6 | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34559G6FP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34559G6-XXXFP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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