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UPD17P133CS Datasheet(PDF) 60 Page - NEC |
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UPD17P133CS Datasheet(HTML) 60 Page - NEC |
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60 / 289 page  CHAPTER 7 SYSTEM REGISTER (SYSREG) 45 7.3 WINDOW REGISTER (WR) 7.3.1 Window Register Configuration Figure 7-5 shows the configuration of the window register. As shown in Figure 7-5, the window register (WR) consists of four bits allocated at address 78H of the system register. The contents of the window register is undefined after a system reset. However, when RESET input is used to release the system from HALT or STOP mode, the previous state of the window register is maintained. Figure 7-5. Window Register Configuration 7.3.2 Window Register Functions The window register is used to transfer data to and from the register file (RF). Data is transferred to and from the register file using the instructions PEEK WR, rf and POKE rf, WR. For details, refer to 9.2.3 Register File Manipulation Instructions. 78H Window register WR Not defined Address Name Bit Symbol Data Initial value when reset b3 b2 b1 b0 |
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