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AT75C Datasheet(PDF) 22 Page - ATMEL Corporation |
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AT75C Datasheet(HTML) 22 Page - ATMEL Corporation |
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22 / 171 page  22 AT75C DSP Subsystem 1368C–INTAP–08/02 Long Index Addressing Mode The base register RB plus a 16-bit immediate index value (embedded in the second instruction opcode word) are used for index-based indirect addressing of the X-RAM or Y-RAM. The index value can vary between -32768 to +32767. The contents of RB remain unaffected. For details, refer to “Index Modifier” on page 16. The software stack located in the data memory is addressed using the stack pointer (SP) register. Program memory is addressed by: • Indirect Addressing Mode The Rn registers of the DAAU and the accumulator can be used for addressing the program memory in specific instructions. • Special Relative Addressing Mode Special Branch Relative (BRR) and Call Relative (CALLR) instructions support jumping relative to the PC (from PC - 63 to PC + 64). |
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