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参数资料
| 型号： | PC87393F-VJG |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 外设及接口 |
| 英文描述： | 100-Pin LPC SuperI/O Devices for Portable Applications |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP100 |
| 封装： | TQFP-100 |
| 文件页数： | 132/148页 |
| 文件大小： | 1733K |
| 代理商： | PC87393F-VJG |
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5.0
Game Port (GMP)
Note: This section applies to the PC87393 and PC87393F only.
5.1
OVERVIEW
This chapter describes a generic Game Port. For the implementation used in this device, see the
Conguration chapter.
The Game Port monitors the interface of up to two game devices, and provides data that can be used to determine the exact
momentary status of these game devices.
A game device is an instrument used for giving commands to a PC, usually to control a game executed on that PC. A Joystick
is a commonly used game device. These commands are given by the game device in a passive manner, by indicating sev-
eral status parameters that can be captured by the system via the Game Port.
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 13 shows the basic system configuration of the Game Port.
Figure 13. Game Port System Conguration
5.2
FUNCTIONAL DESCRIPTION
5.2.1
Game Device Axis Position Indication
A typical game device has the following interface pins:
q
an X-axis position indicator
q
a 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 seen in Figure 14.
Such a mechanism is implemented per game device axis line.
Figure 14. 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
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