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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7713 датащи(PDF) 113 Page - Renesas Technology Corp |
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SH7713 датащи(HTML) 113 Page - Renesas Technology Corp |
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113 / 904 page  Section 3 DSP Operating Unit Rev.1.50 Aug. 30, 2006 Page 73 of 860 REJ09B0288-0150 3.2 DSP Mode Resources 3.2.1 Processing Modes The CPU processing modes can be extended using the mode bit (MD) and DSP bit (DSP) of the status register (SR), as shown below. Description MD DSP Processing Mode Access of Resources Protected in Privileged Mode or Privileged Instruction Execution DSP Extended Functions 0 0 User mode Prohibited Invalid 0 1 User DSP mode Prohibited Valid 1 0 Privileged mode Allowed Invalid 1 1 Privileged DSP mode Allowed Valid As shown above, the extension of the DSP function by the DSP bit can be specified independently of the control by the MD bit. Note, however, that the DSP bit can be modified only in privileged mode. Before the DSP bit is modified, a transition to privileged mode or privileged DSP mode is necessary. 3.2.2 DSP Mode Memory Map In DSP mode, a part of the P2 area in the logical address space can be accessed in user DSP mode. When this area is accessed in user DSP mode, this area is referred to as a Uxy area. X/Y memory is then assigned to this Uxy area. Accordingly, X/Y memory can also be accessed in user DSP mode. Table 3.1 Logical Address Space Address Range Name Protection Description H'A5000000 to H'A5FFFFFF P2/Uxy Privileged or DSP 16-Mbyte physical address space, non- cacheable, non-address translatable Can be accessed in privileged mode, privileged DSP mode, and user DSP mode |
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