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UPD17068 Datasheet(PDF) 47 Page - NEC |
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UPD17068 Datasheet(HTML) 47 Page - NEC |
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47 / 341 page  47 µPD17068 5.4 WINDOW REGISTER (WR) 5.4.1 Format of Window Register Fig. 5-4 shows the format of the window register. As shown in Fig. 5-4, the window register consists of the 4 bits of 78H of a system register. Fig. 5-4 Format of Window Register 5.4.2 Window Register Functions The window register is used to transfer data to and from a register file (RF) described later. For data transfer to and from a register file, the dedicated instructions PEEK WR, rf and POKE rf, WR are used (rf: register file address). The operation performed when each instruction is executed is described in (1) and (2) below. See also Chapter 8. (1) PEEK WR, rf instruction The instruction transfers the contents of the register file addressed by rf to the window register. (2) POKE rf, WR instruction The instruction transfers the contents of the window register to the register file addressed by rf. Address 78H Window register (WR) WR b3 b2 b1 b0 Bit Data Power-on Clock stop CE L S B M S B Symbol Register The previous state is held. Undefined |
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