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M38582GB-XXXFP Datasheet(PDF) 10 Page - Renesas Technology Corp |
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M38582GB-XXXFP Datasheet(HTML) 10 Page - Renesas Technology Corp |
10 / 77 page Rev.1.10 Apr 3, 2006 page 10 of 75 REJ03B0139-0110 3858 Group MEMORY Special Function Register (SFR) Area The Special Function Register area in the zero page contains control 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 Access to this area with only 2 bytes is possible in the zero page addressing mode. Special Page Access to this area with only 2 bytes is possible in the special page addressing mode. Fig. 8 Memory map diagram SFR area Interrupt vector area Reserved ROM area 010016 000016 004016 FF0016 FFDC16 192 256 384 512 640 768 896 1024 1536 2048 XXXX16 00FF16 013F16 01BF16 023F16 02BF16 033F16 03BF16 043F16 063F16 083F16 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 YYYY16 ZZZZ16 RAM ROM ROM area Reserved ROM area (128 bytes) Zero page Special page RAM area RAM size (bytes) Address XXXX16 ROM size (bytes) Address YYYY16 Address ZZZZ16 Not used FFDB16 Reserved ROM area (ROM code protect address) FFFE16 FFFF16 ROM Code Protect Address (address FFDB16) Address FFDB16, which is the reserved ROM area of QzROM, is the ROM code protect address. "0016" is written into this address when selecting the protect bit write by using a serial programmer or selecting protect enabled for writing shipment by Renesas Technology corp.. When "0016" is set to the ROM code protect ad- dress, the protect function is enabled, so that reading or writing from/to QzROM is disabled by a serial programmer. As for the QzROM product in blank, the ROM code is protected by selecting the protect bit write at ROM writing with a serial pro- grammer. As for the QzROM product shipped after writing, "0016" (protect enabled) or "FF16" (protect disabled) is written into the ROM code protect address when Renesas Technology corp. performs writing. The writing of “0016” or “FF16” can be selected as ROM option setup (“MASK option” written in the mask file converter) when or- dering. s Notes Because the contents of RAM are indefinite at reset, set initial val- ues before using. |
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