參數(shù)資料
型號： M37545G8-XXXGP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32
封裝： 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32
文件頁數(shù)： 30/63頁
文件大?。?/td> 774K
代理商： M37545G8-XXXGP
Rev.1.07
Mar 19, 2009
Page 36 of 60
REJ03B0140-0107
7545 Group
Power-on Reset Circuit
Reset can be automatically performed at power on (power-on
reset) by the built-in power-on reset circuit.
In order to use the power-on reset circuit effectively, the time for
the supply voltage to rise from 0 V to 1.8 V must be set to 1 ms
or less.
Voltage Drop Detection Circuit
The built-in voltage drop detection circuit is designed to detect a
drop in voltage and to reset the microcomputer if the supply
voltage drops below a set value (Typ.1.75 V). When the STP
instruction is executed, the voltage drop detection circuit is
stopped, so that the power dissipation is reduced.
The operation of the voltage drop detection circuit is disabled by
setting “0” to bit 4 of the Function set ROM data (address
FFDA16) of the built-in QzROM.
Note: The emulator MCU “M37545RLSS” is not equipped with
the voltage drop detection circuit.
RESETOUT Output
RESETOUT function is used to output “L” level from RESET
pin when system reset occurs by the power-on reset, the voltage
drop detection circuit or the watchdog timer. Also, the built-in
pull-up transistor is connected to the RESET pin.
Fig. 36 Operation waveform diagram of power-on reset
circuit
Fig. 37 Operation waveform diagram of voltage drop detection circuit
<Note on Voltage Drop Detection Circuit>
The voltage drop detection circuit detection voltage of this
product 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
regoes 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;
supply voltage does not fall below to VDET, 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 VDET and re-goes up after that.
Fig. 38 VCC and VDET
VCC (Note)
1 ms or les s
Power-on
Reset released
Internal reset signal
Reset
state
Note: Keep the value of supply voltage to the minimum value
or more of the recommended operating conditions.
Po
circuit output
wer-on reset
Vcc
Internal reset signal
Reset voltage (Typ:1.75V)
Microcomputer starts operation
after f(XIN) clock is counted 16384 times.
Note: The voltage drop detection circuit does not have
the hysteresis characteristics in the detected voltage.
Vcc
VDET
Reset
Normal operation
No reset
Program failure may occur.
Recommended
operating condition
min. value
Vcc
VDET
Recommended
operating condition
min. value
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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