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參數(shù)資料
| 型號： | PSD303L |
| 英文描述： | Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,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備（可編程邏輯，16K的位的SRAM，19余個可編程輸入/輸出，通用PLD的有16個輸入） |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 138K |
| 代理商： | PSD303L |
PSD3XX – Application Note 022
1-214
Summary
Using the PSD3XX family of Programmable Microcontroller Peripherals in 80C51 type
microcontroller designs can significantly reduce system design complexity and enhance
the end product at the same time. Reusing hardware sections of existing designs in new
designs becomes an easy process. Changing memory mapping and even memory sizes
is easily accomplished by making simple adjustments in the PSD3XX development
software, i.e. by simply selecting where and how many of the blocks are required. The
flexibility of the PSD3XX family is demonstrated by the equal ease of design if a Combined
or Separate address space is needed. In addition, the 4-bit memory paging register in the
PSD3X2 and PSD3X3 devices enables the microcontroller to address additional memory
by a factor of 16.
Reset
Circuit
Considerations
In a design where the 80C31 shares the same reset signal with a PSD3XX, a race condition
exists if the reset circuit consists of RC components only. Due to slow fall time on the reset
signal, the 80C31 could get out of reset mode and start fetching codes while the PSD3XX is
still in reset.
The following three reset circuits are recommended for use with 80C31 and PSD3XX based
designs:
1. Use a Reset Chip such as Dallas Semiconductor's DS1232, or Maxim's Max 699.
Both have space saving, 8-pin mini-Dip packages. The reset output is connected
directly to the reset pins on the 80C31 and PSD3XX.
2. Use two separate RC reset circuits: one which generates a high reset pulse to the 80C31
and the other one generates a low reset pulse to the PSD3XX. The RC constant of the
PSD3XX reset circuit should be less thant that of the 80C31 such that the PSD3XX
reset signal has a shorter pulse. In this case, the PSD3XX is configured to have an
active low reset input.
3. Use a buffered reset signal: The ouptut of an RC reset circuit is buffered by a gate
(such as 74HC14) before it is connected to reset pins on the 80C31 and PSD3XX.
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相關代理商/技術參數(shù) |
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| PSD303L-15J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Field-Programmable Peripheral |
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| PSD303L-15LI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Field-Programmable Peripheral |
| PSD303L-15LM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Field-Programmable Peripheral |
| PSD303L-15U | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Field-Programmable Peripheral |
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