參數(shù)資料
型號: μPD784217
廠商: NEC Corp.
英文描述: 8 /16 Bit Single Chip Microcontrollers(8/16位單片微控制器)
中文描述: 8 / 16位單片機微控制器(8 / 16位單片微控制器)
文件頁數(shù): 55/70頁
文件大?。?/td> 271K
代理商: ΜPD784217
μ
PD784217,784218
55
12. 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, oscillation stabilization time (41.9 ms at 12.5 MHz)
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 12-1. Oscillation of Main System Clock during Reset Period
Oscillation is unconditionally
stopped during reset period.
Oscillation stabilization time
Main system clock
oscillation circuit
f
CLK
RESET input
The RESET input pin has an analog delay noise reduction circuit to prevent malfunctioning due to noise.
Figure 12-2. Accepting Reset Signal
Analog delay
Analog delay
Analog
delay
Oscillation
stabilization
time
RESET input
Internal reset signal
Internal clock
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