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UPD17015GS Datasheet(PDF) 22 Page - NEC |
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UPD17015GS Datasheet(HTML) 22 Page - NEC |
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22 / 120 page  22 µPD17015 5. SYSTEM REGISTER (SYSREG) 5.1 OUTLINE OF SYSTEM REGISTER Fig. 5-1 shows where the system registers are located in the data memory, and also outlines the system register. As shown in Fig. 5-1, a system register is allocated to data memory addresses 74H-7FH. The system registers are allocated in the data memory, so that the system registers can be manipulated using any manipulation instructions. For the µPD17015, only the program status word (PSWORD: 7EH and 7FH) in the system register (addresses 74H to 7FH) can be manipulated. Fig. 5-1 Location on Data Memory and Outline of System Registers 74H Address Name Fixed to 0 Outline 75H 7DH 7EH 7FH 012 3 4 56 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 Column address Data memory System register Program status word (PSWORD) Operation control |
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