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UPD78323LP データシート(PDF) 45 Page - NEC |
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UPD78323LP データシート(HTML) 45 Page - NEC |
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45 / 86 page  45 µPD78323, 78324 4.3.2 Context Switching Function by BRKCS Instruction The context switching function can be started by executing BRKCS instruction. The context switched register bank is specified by the lower 3-bit immediate data of the 2nd operation code of BRKCS instruction. When BRKCS instruction is executed, the register bank specified by the 3-bit immediate data is selected, the vector address prestored in the register bank is set and branched to the PC, and the PC and PSW contents are saved into the register bank. Return is by means of executing the RETCSB instruction. Figure 4-4. Context Switching by Execution of BRKCS Instruction OP CODE OP CODE N2 N1 N0 000 111 RBANK0 RBANK7 Register Bank Specification (BRKCS) Register Banks (0 to 7) RBANK n (n = 0 – 7) PC PSW Exchange Save A B R5 R7 D H X C R4 R6 E L VP UP |
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