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SM8521 数据表(PDF) 46 Page - Sharp Corporation |
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SM8521 数据表(HTML) 46 Page - Sharp Corporation |
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46 / 56 page ![]() SM8521 NOTES : • At reset, MMU0 is disable and internal ROM is enable. (1000H-1FFFH). At setting data into MMU0 once, internal ROM becomes disable and MMU0 becomes enable. • In case of changing to external ROM mode by putting some data into MMU register, use Immediate R in "MOV" instruction (MOV R, r or MOV R, R). Data in the next internal ROM address will be fetched at the same time of executing the instruction. Only one byte instruction can be followed when setting data to MMU0 register. A000H 6000H 8000H 4000H 1000H 2000H 0400H 0000H Internal I/O / RAM 1FFFFFH ROM/Flash VRAM E000H FFFFH Extend I/O Extend RAM External ROM/Flash 000000H 4 k-byte 8 k-byte 8 k-byte 8 k-byte 8 k-byte External ROM/Flash External ROM/Flash External ROM/Flash ∗NOTES A000H 6000H 8000H 4000H 1000H 2000H 0400H 0000H Internal I/O / RAM VRAM E000H FFFFH Extend I/O Extend RAM External ROM/Flash 4 k-byte 8 k-byte 8 k-byte 8 k-byte A000H 6000H 8000H 4000H 1000H 2000H 0400H 0000H Internal I/O / RAM VRAM E000H FFFFH Extend I/O Extend RAM External ROM/Flash 8 k-byte 8 k-byte 8 k-byte 8 k-byte In case of MMU0 is disable (At reset) In case of MMU0 is enable External ROM/Flash External ROM/Flash External ROM/Flash External ROM/Flash External ROM/Flash Internal ROM 8 k-byte External ROM/Flash 4 k-byte External ROM/Flash Fig. 23 MMU Mapping Fig. 24 Comparison Figure MMU 0 between Disable and Enable - 46 - |
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