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7721 Datasheet(PDF) 535 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 535 Page - Renesas Technology Corp |
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535 / 577 page  APPENDIX Appendix 9. 7721 Group Q & A 7721 Group User’s Manual 17–72 What are there the stack bank select bit (bit 7 at address 5E16) for? Q Stack, DRAM A It is supposed that DRAM is used as the stack area. When connecting DRAM, the stack pointer addressing mode or stack operation instruction etc. can be used. It is because all of 64 Kbytes can be used as the stack area when bank FF16 which is assigned to DRAM is set as the stack area. (The internal RAM also functions as the temporary area or the register file which is accessed frequently because the internal RAM can be accessed with no Wait. Accordingly, it is expected that the capacity will lack to be used as the stack area. As for the M37721, DRAM area can be set as the stack area because cheap DRAM can be connected.) Use bank 0 which is assigned to the internal RAM area as the stack area when DRAM is not connected or the internal RAM is sufficient to be used as the stack area. |
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