參數(shù)資料
型號(hào): M34524M8-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64
文件頁數(shù): 44/66頁
文件大?。?/td> 1936K
代理商: M34524M8-XXXFP
Rev.1.04
Aug 23, 2007
Page 49 of 146
REJ03B0188-0104
4559 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 48. Structure of RESET pin and its peripherals
Fig 49. RESET pin input waveform and reset release timing
Power-on reset circuit
WEF
Voltage drop detection circuit
RESET pin
(Note 2)
(Note 1)
Pull-up transistor
Internal reset signal
Watchdog reset signal
SRST instruction
Notes 1:
This symbol represents a parasitic diode.
2: Applied potential to RESET pin must be VDD or less.
0.3VDD
0.85VDD
(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.
On-chip oscillator (internal oscillator) is counted 1376
times (Note 2).
=
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