參數(shù)資料
型號: M34571G4
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機(jī)的CMOS
文件頁數(shù): 39/126頁
文件大?。?/td> 1627K
代理商: M34571G4
Rev.1.02
REJ03B0179-0102
May 25, 2007
Page 39 of 124
4571 Group
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
Reset occurs by voltage drop detection circuit
Then when “H” level is applied to RESET pin, software starts
from address 0 in page 0.
(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 satisfied;
the value of supply voltage is the minimum value or more of the
recommended operating conditions.
Fig 40. Structure of reset pin and its peripherals
Fig 41. RESET pin input waveform and reset release timing
Power-on reset circuit
Watchdog reset signal
WEF
SRST instruction
Internal reset signal
(Note 1)
RESET pin
(Note 2)
Pull-up transistor
Voltage drop detection circuit
(Note 1)
Notes 1:
This symbol represents a parasitic diode.
2:
Applied potential to RESET pin must be V
DD
or less.
0.3V
DD
0.85V
DD
(Note 1)
Program starts
(address 0 in page 0)
Reset input
1 machine cycle or more
RESET
f(RING)
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.
X
IN
input is counted 5400 to 5424 times (Note 2).
=
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