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| 型號： | PSD312 |
| 英文描述： | Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,4位頁寄存器,19個可編程I/O,通用PLD有16個輸入) |
| 中文描述： | 現(xiàn)場可編程微控制器外圍設(shè)備（可編程邏輯，16K的位的SRAM，4位頁寄存器，19個可編程的I / O，通用PLD的有16個輸入） |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 144K |
| 代理商： | PSD312 |
1-281
Programmable Peripheral
Application Note 032
Use A ROM Emulator For Rapid Software
Debug Of A PSD3XX-Based Design
By Don Buccini
Introduction
EPROM Emulation has become a relatively easy and inexpensive method to software
debug a small to medium size microcontroller system which uses external EPROMs.
The EPROM is removed from its socket and the RAM-based Emulator is plugged into the
socket, allowing rapid on-line changes and verification of program code. The PSD3XX
family incorporates EPROM, SRAM, I/O Ports and PLD logic into a single package whose
pinouts differ from conventional EPROMs, preventing direct access to the program code.
This Application Note describes an effective way to gain direct access to the on-chip
EPROM without the need for special circuitry on the system circuit board, using any
commercially available ROM Emulator. This allows quick software debug of the system
under test by running the program in RAM and enabling rapid code changes via the
keyboard of a PC. The remaining functions configured in the PSD3XX – SRAM, I/O, Chip
Selects, etc. – are transparent to the emulator and unaffected by its use. Familiarity with
the PSD3XX architecture and the PSDsoft development software is assumed.
Design
Philosophy
The design philosophy is straightforward - gain access to the required interface signals
(A0 – A15, D0 – D7, R, W, E, ALE/AS, etc.) between the selected microcontroller and the
PSD3XX, bypass the EPROM chip selects on the system PSD3XX and program a second
PSD3XX (Emulator PSD3XX) to access the ROM Emulator memory being used to run the
program code. The recent availability of specialized test socket adapters such as
Emulation Technology’s Bug Katcher (P/N BC 4-44-PCC3-0000), shown in Figure 1, allows
easy access to these interface signals without modifying the design of the system circuit
board.
Figure 1. Bug Katcher
– PLCC
.230"
.500"
1.480"
Typ.
Length
W
PLCC
SOCKET
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PSD3-120 | 制造商:Tamura Corporation of America 功能描述: |
| PSD3121212 | 制造商:TDK-Lambda Corporation 功能描述:DC/DC PS DUAL-OUT 12V/-12V 0.13A/-0.13A 3W 7PIN - Bulk |
| PSD3-12-1212 | 功能描述:DC/DC轉(zhuǎn)換器 3W 12V 0.125A RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PSD3121212/S | 制造商:TDK-Lambda Corporation 功能描述:DC/DC PS DUAL-OUT 12V/-12V 0.13A/-0.13A 3W 7PIN - Bulk |
| PSD3-12-1212/S | 功能描述:DC/DC轉(zhuǎn)換器 3W 12V 0.125A RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
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