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M38021M1DXXXSP Datasheet(PDF) 10 Page - Renesas Technology Corp |
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M38021M1DXXXSP Datasheet(HTML) 10 Page - Renesas Technology Corp |
10 / 52 page MITSUBISHI MICROCOMPUTERS 3802 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 9 Memory Special function register (SFR) area The Special Function Register area in the zero page contains con- trol registers such as I/O ports and timers. RAM RAM is used for data storage and for stack area of subroutine calls and interrupts. ROM The first 128 bytes and the last 2 bytes of ROM are reserved for device testing and the rest is user area for storing programs. Interrupt vector area The interrupt vector area contains reset and interrupt vectors. Zero page The 256 bytes from addresses 000016 to 00FF16 are called the zero page area. The internal RAM and the special function regis- ters (SFR) are allocated to this area. The zero page addressing mode can be used to specify memory and register addresses in the zero page area. Access to this area with only 2 bytes is possible in the zero page addressing mode. Special page The 256 bytes from addresses FF0016 to FFFF16 are called the special page area. The special page addressing mode can be used to specify memory addresses in the special page area. Ac- cess to this area with only 2 bytes is possible in the special page addressing mode. Fig. 2 Memory map diagram 010016 000016 004016 044016 FF0016 FFDC16 FFFE16 FFFF16 192 256 384 512 640 768 896 1024 XXXX16 00FF16 013F16 01BF16 023F16 02BF16 033F16 03BF16 043F16 4096 8192 12288 16384 20480 24576 28672 32768 F00016 E00016 D00016 C00016 B00016 A00016 900016 800016 F08016 E08016 D08016 C08016 B08016 A08016 908016 808016 YYYY16 ZZZZ16 RAM ROM Reserved area SFR area Not used Interrupt vector area ROM area Reserved ROM area (128 bytes) Zero page Special page RAM area RAM capacity (bytes) Address XXXX16 ROM capacity (bytes) Address YYYY16 Reserved ROM area Address ZZZZ16 |
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