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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AS8218 데이터시트(PDF) 85 Page - ams AG |
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AS8218 데이터시트(HTML) 85 Page - ams AG |
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85 / 123 page  Data Sheet AS8218 / AS8228 Revision 3.0, 31-May-06 Page 85 of 123 Memory Maps The MCU51 is configured as Von Neumann architecture merging program and data range into one 64kB address space. This space is completely accessible via MOVX and partly accessible via MOVC (0000h – 5FFFh). Besides, there is the typical 8051 structure with 128 bytes of internal memory (I_RAM) and the special function registers (SFRs) also in a 128 byte address space. SFRs Direct addressing FFh 80h 128 bytes I_RAM 7Fh 00h Internal Memory unused FFFFh C000h IDATA /PS Memory Special Function Registers unused A000h unused 1kB X_RAM 24kB P_RAM 5FFFh 0000h 9000h 8000h 6000h unused 9FFFh MPIO LCDD DSP SPI RTC SCT 9500h 9400h 9300h 9200h 9100h 9000h Direct addressing Register indirect addressing Register addressing MOVX A, @DPTR (4 banks) MOVX @DPTR, A Bit addressing MOVC A, @A+PC MOVC A, @A+DPTR } only for 0000h – 5FFFh MOVX @Ri, A MOVXA, @Ri with Ri ε {R0, R1}, P2 represents upper address bits Program Memory (P_RAM) The P_RAM shares address and output data lines with the X_RAM. 24kB out of 64kB addressable memory are used: 0000h – 5FFFh for program storage. |
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