參數(shù)資料
型號(hào)： M34508G4FP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO20
封裝： 5.30 X12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁(yè)數(shù)： 51/106頁(yè)
文件大?。?/td> 1059K
代理商： M34508G4FP
4508 Group
Rev.1.03
2009.07.27
page 47 of 140
REJ03B0148-0103
RESET FUNCTION
System reset is performed by the followings:
“L” level is applied to the RESET pin externally,
System reset instruction (SRST) is executed,
Reset occurs by watchdog timer,
Reset occurs by built-in power-on reset (only for H version)
Reset occurs by voltage drop detection circuit (only for H version)
Then when “H” level is applied to RESET pin, software starts from
address 0 in page 0.
Fig. 40 Structure of reset pin and its peripherals
Fig. 41 RESET pin input waveform and reset release timing
WEF
This symbol represents a parasitic diode.
2: Applied potential to RESET pin must be VDD or less.
(Note 1)
(Note 2)
Pull-up transistor
RESET
pin
Notes 1:
Voltage drop detection circuit
Watchdog reset signal
Power-on reset circuit
SRST instruction
(Note 3)
3: These are equipped with only H version.
Internal reset signal
RESET
0.3VDD
0.85VDD
(Note 1)
Notes 1: Keep the value of supply voltage to the minimum value
or more of the recommended operating conditions.
2: It depends on the internal state at reset.
Reset input
1 machine cycle or more
=
Program starts
(address 0 in page 0)
On-chip oscillator (internal oscillator)
is
counted 120 to 144 times (Note 2).
f(RING)
(1) RESET pin input
System reset is performed certainly by applying “L” level to RESET
pin for 1 machine cycle or more when the following condition is sat-
isfied;
the value of supply voltage is the minimum value or more of the rec-
ommended operating conditions.
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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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