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參數(shù)資料
| 型號： | UPD784915A |
| 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)： | 60/86頁 |
| 文件大?。?/td> | 446K |
| 代理商： | UPD784915A |
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μ
PD784915A, 784916A
60
4.4 Reset Function
When a low-level signal is input to the RESET pin, the system is reset, and each hardware unit is initialized (reset
status). During the reset period, oscillation of the system clock is unconditionally stopped, so that the current
dissipation of the overall system can be reduced.
When the RESET pin goes high, the reset status is cleared. After the count time of the oscillation stabilization timer
(32.8 ms at 16 MHz or 65.6 ms at 8 MHz) has elapsed, the contents of the reset vector table are set to the program
counter (PC), and execution branches to the address set to the PC, and the program is executed starting from the
branch destination address. Therefore, execution can be reset and started from any address.
Figure 4-7. Oscillation of Main System Clock during Reset Period
The RESET pin is provided with an analog delay noise rejecter circuit to prevent malfunctioning due to noise.
Figure 4-8. Accepting Reset Signal
Main system clock
oscillation circuit
f
CLT
RESET input
Oscillation stabilization
timer count time
During reset, oscillation
is unconditionally stopped.
RESET input
Internal reset signal
Internal clock
Analog delay
Analog delay
Analog
delay
Oscillation
stabilization
time
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