參數(shù)資料
型號: 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
文件頁數(shù): 28/154頁
文件大小: 1778K
代理商: M34551E8-XXXFP
APPLICATION
2-46
4551 Group User’s Manual
2.7 Reset
System reset is performed by applying “L” level to the RESET pin for 1 machine cycle or more when the
following conditions are satisfied;
the value of supply voltage is the minimum value or more of the recommended operating conditions,
oscillation is stabilized.
Then when “H” level is applied to the RESET pin, the software starts from address 0 in page 0 after elapsing
the internal oscillation stabilizing time (f(XIN) is counted 10757 to 10786 machine cycles). Figure 2.7.3
shows the oscillation stabilizing time.
2.7.1 Reset circuit
The 4551Group has the power-on reset circuit and voltage drop detection circuit.
(1)
Power-on reset
Reset can be performed automatically at power on (power-on reset) by the built-in power-on reset
circuit. When the built-in power-on reset circuit is used, set the time until the supply voltage rises to
the minimum operation voltage to 100
s or less. When the rising time exceeds 100 s, connect a
capacitor between the RESET pin and VSS at the shortest distance, input “L” level to RESET pin until
the supply voltage reaches the minimum operation voltage.
Figure 2.7.1 shows the power-on reset example and Figure 2.7.2 shows the reset circuit example
when the supply voltage rising time exceeds 100
s.
Fig. 2.7.1 Power-on reset circuit example
VDD
Power-on reset circuit
output voltage
Internal reset signal
Power-on
RESET
pin
WEF
Watchdog timer
output
Internal reset
signal
Reset
state
Reset released
This symbol represents a parasitic
diode.
Note:
Applied potential to RESET pin must
be VDD or less.
(Note)
Power-on
reset circuit
Pull-up
transistor
Voltage drop detection circuit
q
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