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參數(shù)資料
| 型號： | UPD784215AY |
| 廠商： | NEC Corp. |
| 英文描述： | 16-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 16位單晶片微控制器 |
| 文件頁數(shù)： | 62/100頁 |
| 文件大?。?/td> | 561K |
| 代理商： | UPD784215AY |
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Data Sheet U14121EJ2V0DS00
62
μ
PD784214A, 784215A, 784216A, 784217A, 784218A, 784214AY, 784215AY, 784216AY, 784217AY, 784218AY
11. RESET FUNCTION
When a low-level signal is input to the RESET pin, the system is reset, and each hardware unit is initialized
(reset). During the reset period, oscillation of the main system clock is unconditionally stopped. Consequently, the
current consumption of the entire system can be reduced.
When the RESET signal goes high, the reset status is cleared. And after the oscillation stabilization time (84.0 ms
at 12.5 MHz operation) elapses, the contents of the reset vector table are set to the program counter (PC), execution
branches to an address set to the PC, and program execution is started from that branch address. Therefore, the
program can be reset and started from any address.
Figure 11-1. Oscillation of Main System Clock During Reset Period
The RESET input pin has an analog delay noise eliminator to prevent malfunctioning due to noise.
Figure 11-2. Acknowledgement of Reset Signal
Oscillation is unconditionally
stopped during reset period
Oscillation stabilization time
Main system clock
oscillator
f
CLK
RESET input
Analog delay
Analog delay
Analog
delay
Oscillation
stabilization
time
Time until clock
starts oscillating
RESET input
Internal reset signal
Internal clock
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