參數(shù)資料
型號(hào)： M37549G1-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封裝： 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁(yè)數(shù)： 39/84頁(yè)
文件大小： 1378K
代理商： M37549G1-XXXFP
Rev.2.02
Mar 31, 2009
Page 44 of 81
REJ03B0202-0202
7549 Group
Power-on Reset Circuit
Reset can be automatically performed at power on (power-on
reset) by the built-in power-on reset circuit.
To use the built-in power-on reset circuit, leave the RESET pin
open (the pull-up resistor is built-in).
Low Voltage Detection Circuit
The built-in low voltage detection circuit is designed to detect a
drop in voltage and to reset the microcomputer if the power
source voltage drops below a set value (Typ.1.95 V).
The low voltage detection circuit is valid by setting “1” to bit 0
of the function set ROM data 0.
Also, when “1” is set to bit 2 of the function set ROM data 1, the
low voltage detection circuit can be valid even in the stop mode.
The low voltage detection circuit is stopped in the stop mode by
setting “0” to this bit, so that the power dissipation is reduced.
Fig 56. Operation waveform diagram of power-on
reset circuit
Fig 57. Operation waveform diagram of low voltage detection circuit
Fig 58. Timing diagram at reset
VCC (Note)
Power-on reset circuit output
Internal reset signal
Note: Keep the value of supply voltage to
the minimum value or more of the
recommended operating conditions.
Reset released
Reset
state
Power-on
VCC
Internal reset signal
Reset voltage (Typ:1.95V)
Microcomputer starts operation
by the built-in on-chip oscillator.
?
FFFC
FFFD
ADH,ADL
?
ADL
ADH
Reset address from the
vector table
Low-speed on-chip
oscillator clock
Internal CPU clock
φ
?
RESET
Internal reset
signal
SYNC
Address
Data
9 to 16 cycles of
internal CPU clock
φ
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