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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC24HJ128GP310 датащи(PDF) 30 Page - Microchip Technology |
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PIC24HJ128GP310 датащи(HTML) 30 Page - Microchip Technology |
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30 / 286 page  PIC24HJXXXGPX06/X08/X10 DS70175F-page 28 © 2007 Microchip Technology Inc. FIGURE 3-4: DATA MEMORY MAP FOR PIC24HJXXXGPX06/X08/X10 DEVICES WITH 16 KBYTES RAM 3.2.5 DMA RAM Every PIC24HJXXXGPX06/X08/X10 device contains 2 Kbytes of dual ported DMA RAM located at the end of data space. Memory locations in the DMA RAM space are accessible simultaneously by the CPU and the DMA controller module. DMA RAM is utilized by the DMA controller to store data to be transferred to various peripherals using DMA, as well as data transferred from various peripherals using DMA. The DMA RAM can be accessed by the DMA controller without having to steal cycles from the CPU. When the CPU and the DMA controller attempt to concurrently write to the same DMA RAM location, the hardware ensures that the CPU is given precedence in accessing the DMA RAM location. Therefore, the DMA RAM provides a reliable means of transferring DMA data without ever having to stall the CPU. 0x0000 0x07FE 0xFFFE LSB Address 16 bits LSB MSB MSB Address 0x0001 0x07FF 0xFFFF Optionally Mapped into Program Memory 0x47FF 0x47FE 0x0801 0x0800 Near Data 2 Kbyte SFR Space 16 Kbyte SRAM Space 8 Kbyte Space 0x8001 0x8000 0x4800 0x4801 0x3FFE 0x4000 0x3FFF 0x4001 0x1FFE 0x1FFF SFR Space X Data Unimplemented (X) DMA RAM X Data RAM (X) Note: DMA RAM can be used for general purpose data storage if the DMA function is not required in an application. |
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