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參數(shù)資料
| 型號(hào)： | PSD402A1-C-90JI |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Low Cost Field Programmable Microcontroller Peripherals |
| 中文描述： | 低成本現(xiàn)場(chǎng)可編程微控制器外圍設(shè)備 |
| 文件頁(yè)數(shù)： | 68/123頁(yè) |
| 文件大?。?/td> | 657K |
| 代理商： | PSD402A1-C-90JI |
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PSD4XX Famly
65
The PSD4XX
Architecture
(cont.)
Figure 34. Port A In Peripheral I/OMode
RD
PSEL0
PSEL1
D0 – D7
WR
PA0 – PA7
9.4.5 Peripheral I/O
The Peripheral I/O Mode is one of the operating modes of Port A. In this mode, Port A
is connected to the data bus of peripheral devices. Port A is enabled only when
the microcontroller is accessing the devices, otherwise the Port is tri-stated. This feature
enables the microcontroller to access external devices without requiring buffers and
decoders. Figure 34 shows the structure of Port A in the Peripheral I/O Mode.
The memory address space occupied by the devices are defined by two signals: PSEL0
and PSEL1. The signals are direct outputs from the Decoding PLD (DPLD). Whenever any
of the signals is active, the Port A driver is enabled, and the direction of the data flow is
determined by the RD/WR signals.
The Peripheral I/O Mode and the peripheral select signals are configured and defined in the
PSDsoft Software (see the section on I/O Port for configuration). The PIO bit in the VM
Register (see Table 17) also needs to be set to “1” by the user to initialize the Peripheral I/O
Mode.
The Peripheral I/O mode can be used, for example, in DMA applications where the
microcontroller does not support DMA operations, such as tri-stating the address/data bus.
Figure 35 shows a block diagram of a microcontroller and PSD4XX based design that
makes use of this mode. In this application, the microcontroller has a multiplexed bus which
is connected to the ADIO port. The C and D ports connect to the peripheral address bus
and are both configured in Address Out Mode. Port A is configured in the Peripheral I/O
mode and is connected to the peripheral data bus. Ports B and E are used to generate
control signals.
During normal activity, the microcontroller has access to any peripheral (memory or I/O
device) through the PSD4XX device. When there is a DMA request, the
microcontroller tri-states the address bus on Ports C and D by writing a “0” to the port
Direction Registers. The DMA controller then takes over the data and address buses after
receiving acknowledgement from the microcontroller.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PSD412A1-C-90JI | Low Cost Field Programmable Microcontroller Peripherals |
| PSD402A1-C-90UI | Low Cost Field Programmable Microcontroller Peripherals |
| PSD402A2-C-15J | Low Cost Field Programmable Microcontroller Peripherals |
| PSD412A2-C-15J | Low Cost Field Programmable Microcontroller Peripherals |
| PSD402A2-C-15L | Low Cost Field Programmable Microcontroller Peripherals |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PSD402A1-C-90UI | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Low Cost Field Programmable Microcontroller Peripherals |
| PSD402A2 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:PSD4XX/ZPSD4XX FAMILY FIELD-PROGRAMMABLE MICROCONTROLLER PERIPHERALS |
| PSD402A2-12J | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Field-Programmable Peripheral |
| PSD402A2-12JI | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Field-Programmable Peripheral |
| PSD402A2-12LI | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Field-Programmable Peripheral |
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