參數(shù)資料
型號(hào)： M34551
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER
中文描述： 單芯片4位CMOS微機(jī)紅外遙控器
文件頁(yè)數(shù)： 30/68頁(yè)
文件大?。?/td> 698K
代理商： M34551
30
MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
Note: Keep the value of supply voltage the minimum
value or more
of the recommended operating conditions.
RESET
0.3V
DD
Software start
(Address 0 in page 0)
Reset input
=
1machine cycle or more
f(X
IN
) is counted
10757 to 10786 times
(Note)
0.85V
DD
RESET FUNCTION
System reset is performed by applying “L” level to
RESET
pin
for 1 machine cycle or more when the following condition is
satisfied;
____________
the value of supply voltage is the minimum value or more of
the recommended operating conditions.
Then when “H” level is applied to
RESET
pin, software starts
from address 0 in page 0.
V
DD
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.
Applied potential to RESET pin must
be V
DD
or less.
Note:
(Note)
Power-on
reset circuit
Pull-up
transistor
Voltage drop detection circuit
f(X
IN
)
RESET
f(X
IN
) is counted
10757 to 10786 times
Software start
(Address 0 in page 0)
Note: The number of clock cycles depends on the internal state of
the microcomputer when reset is performed.
(Note)
“H”
“L”
Fig. 28 Reset release timing
Fig. 29 RESET pin input waveform and reset operation
(1) Power-on reset
Reset can be automatically performed at power on (power-
on reset) by the built-in power-on reset circuit. When the built-
in power-on reset circuit is used, the time for the supply voltage
to reach the minimum operating voltage must be set to 100
μ
s or less. If the rising time exceeds 100
μ
s, connect a
capacitor between the
RESET
pin and V
SS
at the shortest
distance, and input “L” level to
RESET
pin until the value of
supply voltage reaches the minimum operating voltage.
Fig. 30 Power-on reset circuit example
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