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參數(shù)資料
| 型號： | UPD784908GF |
| 廠商： | NEC Corp. |
| 英文描述： | 16-BIT SINGLE-CHIP MICROCONTROLLER |
| 中文描述： | 16位單片機(jī) |
| 文件頁數(shù)： | 63/98頁 |
| 文件大?。?/td> | 657K |
| 代理商： | UPD784908GF |
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μ
PD784907, 784908
63
Data Sheet U11680EJ2V0DS00
12. RESET FUNCTION
When a low-level signal is input to the RESET pin, the internal hardware becomes initialize status (reset status).
When the RESET input makes a low-to-high transition, the following data is loaded into the program counter (PC):
Low-order 8 bits of the PC:
Intermediate 8 bits of the PC: Contents of address 0001H
High-order 4 bits of the PC:
Contents of address 0000H
0
The PC contents are used as a branch destination address, and program execution starts from that address.
Therefore, a reset start can be performed from an arbitrary address.
The contents of each register can be set by software, as necessary.
The RESET input circuit incorporates a noise eliminator to prevent malfunctions caused by noise. This noise
eliminator is an analog delay sampling circuit.
Figure 12-1. Accepting Reset
For power-on reset, the RESET signal must be held active until the oscillation stabilization time (approximately 40
ms) has elapsed.
Figure 12-2. Power-On Reset
RESET
(input)
Delay
Delay
Delay
Initialize PC
Execute instruction
of reset start address
Internal reset signal
Start reset
End reset
Oscillation stabilization time
Delay
Initialize PC
Execute instruction of
reset start address
RESET
(input)
Internal reset signal
End reset
V
DD
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