參數(shù)資料
型號(hào): UPD784054GCA1
廠商: NEC Corp.
英文描述: 16-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16位單片機(jī)
文件頁(yè)數(shù): 48/86頁(yè)
文件大?。?/td> 579K
代理商: UPD784054GCA1
μ
PD784054(A)
48
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).
Low-order 8 bits of PC :
Middle 8 bits of PC
High-order 4 bits of PC:
contents of address 0000H
contents of address 0001H
0
:
Program execution is started from the set contents of the PC. Therefore, the contents of the PC are assumed
as a branch destination address, and 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
RESET
(input)
Internal reset signal
Delay
Delay
Delay
PC initialization
Instruction execution
at reset start address
Reset starts
Reset ends
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
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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