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參數(shù)資料
| 型號(hào)： | μPD784035(A) |
| 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(jī)微控制器（8 / 16位單片微控制器） |
| 文件頁(yè)數(shù)： | 53/90頁(yè) |
| 文件大?。?/td> | 402K |
| 代理商： | ΜPD784035(A) |
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μ
PD784035(A), 784036(A)
53
11. RESET FUNCTION
Applying a low-level signal to the RESET pin initializes the internal hardware (reset status).
When the RESET input makes a low-to-high transition, the following data is loaded into the program counter (PC):
Eight low-order bits of the PC
Intermediate eight bits of the PC : Contents of location at address 0001H
Four high-order bits of the PC
: 0
: Contents of location at address 0000H
The PC contents are used as a branch destination address. 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 required.
The RESET input circuit contains a noise eliminator to prevent malfunctions caused by noise. This noise eliminator
is an analog delay sampling circuit.
Figure 11-1. Accepting a Reset
RESET
(input)
Delay
Delay
Delay
Initialize PC
Execute instruction
at reset start address
Internal reset signal
Start reset
End reset
For power-on reset, the RESET signal must be held active until the oscillation settling time (approximately 40 ms)
has elapsed.
Figure 11-2. Power-On Reset
Oscillation settling time
Delay
Initialize PC
Execute instruction at
reset start address
RESET
(input)
Internal reset signal
End reset
V
DD
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