參數(shù)資料
型號(hào)： μPD784031Y
廠商： NEC Corp.
英文描述： 8/16 Bit Single Chip Microcontrollers(8/16 位微控制器)
中文描述： 8 / 16位單片機(jī)微控制器（8 / 16位微控制器）
文件頁(yè)數(shù)： 51/66頁(yè)
文件大小： 392K
代理商： ΜPD784031Y
51
μ
PD784031Y
11. RESET FUNCTION
When the low level is input to the RESET pin, the internal hardware is initialized (reset status).
When the RESET pin goes high, the following data are set to the program counter (PC).
Lower 8 bits of PC: contents of address 0000H
Middle 8 bits of PC: contents of address 0001H
Higher 4 bits of PC: 0
Program execution is started from a branch destination address which is the contents of the PC. Therefore, the
system can be reset and started from any address.
Set the contents of each register by program as necessary.
The RESET input circuit has a noise reduction circuit to prevent malfunctioning due to noise. This noise reduction
circuit is a sampling circuit by analog delay.
Figure 11-1. Accepting RESET Signal
Assert the RESET signal active until the oscillation stabilization time (approx. 40 ms) elapses to execute a power-
ON reset operation.
Figure 11-2. Power-ON Reset Operation
Delay
RESET
(input)
Delay
Internal reset signal
Reset starts
Reset ends
Delay
Initialize PC
Executes instruction at
reset start address
RESET
(input)
Internal reset signal
Reset ends
Oscillation stabilization time
Delay
Initialize PC
Executes instruction at
reset start address
V
DD
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