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38K0 Datasheet(PDF) 28 Page - Renesas Technology Corp |
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38K0 Datasheet(HTML) 28 Page - Renesas Technology Corp |
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28 / 328 page  FUNCTIONAL DESCRIPTION Rev.2.00 Oct 05, 2006 page 11 of 112 38K0 Group REJ09B0337-0200 HARDWARE 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. In the flash memory version, program and erase can be performed in the reserved area. 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. 8 Memory map diagram 192 256 384 512 640 768 896 1024 1536 2048 00FF16 013F16 01BF16 023F16 02BF16 033F16 03BF16 043F16 063F16 083F16 RAM area RAM size (bytes) Address XXXX16 4096 8192 12288 16384 20480 24576 28672 32768 36864 40960 45056 49152 53248 57344 61440 F00016 E00016 D00016 C00016 B00016 A00016 900016 800016 700016 600016 500016 400016 300016 200016 100016 F08016 E08016 D08016 C08016 B08016 A08016 908016 808016 708016 608016 508016 408016 308016 208016 108016 ROM area ROM size (bytes) Address YYYY16 Address ZZZZ16 010016 000016 004016 0FE016 FF0016 FFDC16 FFFE16 FFFF16 XXXX16 YYYY16 ZZZZ16 RAM ROM SFR area Not used Interrupt vector area Reserved ROM area (128 bytes) Zero page Special page Reserved ROM area 0FFF16 SFR area |
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