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SM8521 Datasheet(PDF) 45 Page - Sharp Corporation

Part # SM8521
Description  8-Bit Single-Chip Microcomputer
PDF  56 Pages
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Manufacturer  SHARP [Sharp Corporation]
Direct Link  http://sharp-world.com/
Logo SHARP - Sharp Corporation

SM8521 Datasheet(HTML) 45 Page - Sharp Corporation

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SM8521
- 45 -
MMU
The SM8521 supports an MMU used to external
memory area expansion.
Memory area 1000H-9FFFH, can be expanded to
2M-byte in each 8k-byte unit.
MMUx is selected depends on CPU address.
NOTE :
CPU can not access lower 4 k-byte of MMU0 because of
occupied by internal RAM and register file. On the other
hand, each 8 k-byte of external ROM is accessible as
DMA's address.
7
15
12
13
0
MMU0 (0000H-1FFFH)
CPU address
MMU1 (2000H-3FFFH)
MMU2 (4000H-5FFFH)
MMU3 (6000H-7FFFH)
0
20
12
13
External memory address
0
MMU4 (8000H-9FFFH)
Fig. 22
An Example of MMU Switching Flow and Mapping



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