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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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PC87373 数据表(PDF) 125 Page - National Semiconductor (TI) |
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PC87373 数据表(HTML) 125 Page - National Semiconductor (TI) |
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125 / 174 page  125 www.national.com Revision 1.1 10.0 Game Port (GMP) 10.1 OVERVIEW This chapter describes a generic Game Port. For the implementation used in this device, see Section 3.16.1 on page 70. The Game Port monitors the interface of up to two game devices and provides data that can be used to determine the status of these game devices at any specific moment. A game device is an instrument used for inputting commands to a PC, usually to control a game executed on that PC. The game device inputs these commands passively, by indicating several status parameters that can be captured by the system via the Game Port. A joystick is a commonly used game device. The status of a game device includes the following parameters: q Button status (pressed/released) of up to two buttons per game device q Horizontal (X-axis) position indicated by the game device q Vertical (Y-axis) position indicated by the game device Figure 34 shows the basic system configuration of the Game Port. Figure 34. Game Port System Configuration 10.2 FUNCTIONAL DESCRIPTION 10.2.1 Game Device Axis Position Indication A typical game device has the following interface pins: q X-axis position indicator q Y-axis position indicator q One or two button status indicator(s) The X and Y axis indicators are fed into the Game Port via pins JOYnX and JOYnY, respectively, where ‘n’ indicates the game device number. The status indicators of buttons 0 and 1 are fed into the Game Port via JOYnBTN0,1, respectively. The X and Y axis position indication mechanism of each game device includes external components, as shown in Figure 35. Such a mechanism is implemented for each axis line of each game device. Figure 35. Game Device Axis Position Indication Mechanism Game Port Game Device Game Device Interface X-Axis Y-Axis Button 1 Button 0 Game Device Game Device A Circuitry X-Axis Y-Axis Button 1 Button 0 RCX RVX CX Game Port JOYnX JOYnY Game Device X/Y-Axis Varying Waveform Shaping Circuit Pins Resistor X/Y-Axis Circuit Discharge Control X/Y-Axis Indicators Input Path External Components |
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