參數(shù)資料
型號： M34250M2-XXXFP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 4.4 MHz, MICROCONTROLLER, PDSO20
封裝： PLASTIC, SOP-20
文件頁數(shù)： 19/59頁
文件大小： 713K
代理商： M34250M2-XXXFP
25
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
Fig. 22 Power-on reset circuit example
(2) Internal state at reset
Table 11 shows port state at reset, and Figure 23 shows
internal state at reset (they are retained after system is released
from reset).
Table 11 Port state at reset
The contents of timers, registers, flags and RAM except shown
in Figure 23 are undefined, so set the initial value to them.
Name
D0, D1, D2/C, D3/K
S0–S3
G0/INT, G1/TOUT
G2, G3
F0, F1
State
High impedance
(Note)
Function
D0, D1, D2/C, D3/K
S0–S3
G0/INT, G1
G2, G3
F0, F1
Note: Output latch is set to “1.”
(1) Power-on reset
Reset can be automatically performed at power on (power-on
reset) by connecting a resistor, a diode, and a capacitor to
RESET
pin. Connect RESET pin and the external circuit at the
shortest distance.
VDD
RESET pin voltage
Internal reset signal
Power-on
RESET
pin
This symbol represents a parasitic diode.
Internal reset
signal
Reset state
Reset released
Note: Applied potential to RESET pin
must be 7 V or less.
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