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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SC9RS08KA2 데이터시트(PDF) 27 Page - Freescale Semiconductor, Inc |
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SC9RS08KA2 데이터시트(HTML) 27 Page - Freescale Semiconductor, Inc |
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27 / 134 page  Chapter 4 Memory SC9RS08KA2 Series Data Sheet, Rev. 1 Freescale Semiconductor 27 4.2 Unimplemented Memory Attempting to access either data or an instruction at an unimplemented memory address will cause reset. 4.3 Indexed/Indirect Addressing Register D[X] and register X together perform the indirect data access. Register D[X] is mapped to address $000E. Register X is located in address $000F. The 8-bit register X contains the address that is used when register D[X] is accessed. Register X is cleared to zero upon reset. By programming register X, any location on the first page ($0000–$00FF) can be read/written via register D[X]. Figure 4-2 shows the relationship between D[X] and register X. For example, in HC08/S08 syntax lda ,x is comparable to lda D[X] in RS08 coding when register X has been programmed with the index value. The physical location of $000E is in RAM. Accessing the location through D[X] returns $000E RAM content when register X contains $0E. The physical location of $000F is register X, itself. Reading the location through D[X] returns register X content; writing to the location modifies register X. Figure 4-2. Indirect Addressing Registers 4.4 RAM and Register Addresses and Bit Assignments The fast access RAM area can be accessed by instructions using tiny, short, and direct addressing mode instructions. For tiny addressing mode instructions, the operand is encoded along with the opcode to a single byte. D[X] Register X Content of this location can be accessed via D[X] $000E $000F $00FF Address indicated in $0100 Register X can specify any location between $0000–$00FF Register X $0000 |
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