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參數(shù)資料
| 型號(hào)： | UPD784021GK-BE9 |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 16/8-BIT單片機(jī) |
| 文件頁數(shù)： | 53/90頁 |
| 文件大小： | 614K |
| 代理商： | UPD784021GK-BE9 |
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53
m
PD784020, 784021
12. 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.
Fig. 12-1 Accepting a Reset
For power-on reset, the RESET signal must be held active until the oscillation settling time (approximately 40 ms)
has elapsed.
Fig. 12-2 Power-On Reset
RESET
(input)
Delay
Delay
Delay
Initialize PC
Execute instruction
at reset start address
Internal reset signal
Start reset
End 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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| UPD784020 | 16/8-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD784021 | 16/8-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD784031GC-3B9 | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| UPD784031GC-8BT | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| UPD784031GK-BE9 | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD784031GC-8BT-A | 制造商:Renesas Electronics Corporation 功能描述:MCU 8BIT/16BIT 78K4 CISC ROMLESS 3.3V/5V 80PQFP - Trays 制造商:Renesas Electronics 功能描述:16 制造商:Renesas Electronics 功能描述:16 Cut Tape |
| UPD784031GK-9EU-A | 制造商:Renesas Electronics Corporation 功能描述:16BIT K4 ROMLESS - Bulk |
| UPD784031YGC-8BT | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD784031YGC-8BT-A | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD784031YGK-9EU | 制造商:Renesas Electronics Corporation 功能描述: |
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