參數(shù)資料
型號: M34501E4FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PDSO20
封裝: 5.30 X 12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁數(shù): 54/118頁
文件大小: 952K
代理商: M34501E4FP
Rev.3.01
2005.02.07
page 38 of 112
REJ03B0104-0301
4501 Group
Fig. 35 Structure of reset pin and its peripherals, and power-on reset operation
Name
D0, D1
D2/C, D3/K
P00, P01, P02, P03
P10, P11, P12/CNTR, P13/INT
P20/AIN0, P21/AIN1
Notes 1: Output latch is set to “1.”
2: Pull-up transistor is turned OFF.
Function
D0, D1
D2, D3
P00–P03
P10–P13
P20, P21
State
High-impedance (Note 1)
High-impedance (Notes 1, 2)
(1) Power-on reset
Reset can be automatically performed at power on (power-on re-
set) 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
rise from 0 V to 2.0 V must be set to 100
s or less. If the rising
time exceeds 100
s, connect a capacitor between the RESET pin
and VSS at the shortest distance, and input “L” level to RESET pin
until the value of supply voltage reaches the minimum operating
voltage.
Table 14 Port state at reset
RESET pin
WEF
Watchdog reset signal
(Note 1)
Pull-up transistor
(Note 1)
Power-on reset circuit
Volgate drop detection circuit
VDD (Note 3)
100
s or less
(Note 2)
Internal reset signal
Power-on
Reset released
Internal reset signal
Reset
state
Notes 1:
This symbol represents a parasitic diode.
2: Applied potential to RESET pin must be VDD or less.
3: Keep the value of supply voltage to the minimum value
or more of the recommended operating conditions.
Power-on reset circuit output
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