參數(shù)資料
型號: μPD784046(A)
廠商: NEC Corp.
英文描述: 16 Bit Single Chip Microcontrollers(16 位單片微控制器)
中文描述: 16位單片機微控制器(16位單片微控制器)
文件頁數(shù): 51/90頁
文件大?。?/td> 613K
代理商: ΜPD784046(A)
μ
PD784044(A), 784046(A)
51
11. RESET FUNCTION
When a low level is input to the RESET pin, the internal hardware is initialized (reset status).
When the RESET signal goes high, the following data is 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
The contents of the PC are assumed as a branch destination address and program execution is started from
this address. Therefore, the program can be reset and started from any address.
Set the contents of each register by program as necessary.
To prevent malfunctioning due to noise, a noise rejection circuit is provided to the RESET input circuit. This
noise rejection circuit is a sampling circuit with analog delay.
Figure 11-1. Accepting Reset
Keep the RESET signal active until the oscillation stabilization time (about 40 ms) elapses when executing
a reset operation on power application or when releasing the STOP mode by reset.
Figure 11-2. Reset Operation on Power Application
RESET
(input)
Internal reset signal
Delay
Delay
Delay
PC initialization
Instruction execution
at reset start address
Reset starts
Reset ends
V
DD
RESET
(input)
Internal reset signal
Delay
Initializes PC
Instruction execution at reset start address
Oscillation stabilization time
Reset ends
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