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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89C51CC03U-RDTIM 데이터시트(PDF) 23 Page - ATMEL Corporation |
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AT89C51CC03U-RDTIM 데이터시트(HTML) 23 Page - ATMEL Corporation |
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23 / 197 page  23 AT89C51CC03 4182K–CAN–05/06 Data Memory The AT89C51CC03 provides data memory access in two different spaces: 1. The internal space mapped in three separate segments: • the lower 128 Bytes RAM segment. • the upper 128 Bytes RAM segment. • the expanded 2048 Bytes RAM segment (ERAM). 2. The external space. A fourth internal segment is available but dedicated to Special Function Registers, SFRs, (addresses 80h to FFh) accessible by direct addressing mode. Figure 8 shows the internal and external data memory spaces organization. Figure 7. Internal Memory - RAM Figure 8. Internal and External Data Memory Organization ERAM-XRAM Upper 128 Bytes Internal RAM Lower 128 Bytes Internal RAM Special Function Registers 80h 80h 00h FFh FFh direct addressing addressing 7Fh direct or indirect indirect addressing 256 up to 2048 Bytes 00h 64K Bytes External XRAM 0000h FFFFh Internal ERAM EXTRAM = 0 EXTRAM = 1 FFh or 7FFh Internal External |
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