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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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PC87366 数据表(PDF) 163 Page - National Semiconductor (TI) |
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PC87366 数据表(HTML) 163 Page - National Semiconductor (TI) |
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163 / 240 page  9.0 Game Port (GMP) (Continued) 163 www.national.com 9.3.6 Game Device A X-Axis Position Low Byte (GMPAXL) Reading this register returns the value of the low byte of the X-axis position counter of game Device A. Before reading this register verify that bit 0 of GMPXST (Device A Position Counter Ready) is set to 1. Writing to the offset of this register is ignored. This register is functional only in Enhanced mode. Location: Offset 04h Type: RO 9.3.7 Game Device A X-Axis Position High Byte (GMPAXH) Reading this register returns the value of the high byte of the X-axis position counter of game Device A. Read this register after reading the GMPAXL register, and verifying that bit 0 of GMPXST (Device A Position Counter Ready) is set to 1. Writing to the offset of this register is ignored. This register is functional only in Enhanced mode. Location: Offset 05h Type: RO 9.3.8 Game Device A YAxis Position Low Byte (GMPAYL) Reading this register returns the value of the low byte of the Y-axis position counter of game Device A. Before reading this register verify that bit 1 of GMPXST (Device A Position Counter Ready) is set to 1. Writing to the offset of this register is ignored. This register is functional only in Enhanced mode. Location: Offset 06h Type: RO 9.3.9 Game Device A Y-Axis Position High Byte (GMPAYH) Reading this register returns the value of the high byte of the Y-axis position counter of game Device A. Read this register after reading the GMPAYL register and verifying that bit 1 of GMPXST (Device A Position Counter Ready) is set to 1. Writing to the offset of this register is ignored. This register is functional only in Enhanced mode. Location: Offset 07h Type: RO Bit 76543210 Name Device A X-Axis Position Counter Low Byte Reset 00000000 Bit 76543210 Name Device A X-Axis Position Counter High Byte Reset 00000000 Bit 76543210 Name Device A Y-Axis Position Counter Low Byte Reset 00000000 Bit 76543210 Name Device A Y-Axis Position Counter High Byte Reset 00000000 |
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