LPC47M192 datasheet(126/228 Pages) SMSC

126 / 228 page

SMSC DS – LPC47M192

Page 126

Rev. 03/30/05

DATASHEET

The figure below illustrates the implementation of the game port logic in the LPC47M192.

Game software will write a byte to the game port to reset it, and then poll (read) the port until the x and y-axis RC time

constant pins (TIMA,B) time out (return to zero). The elapsed time indicates the resistance value of the potentiometer

and in turn, the position of the joystick.

The figure below illustrates the timing of the game port signals. The 556 timers will reset the outputs (OUTA,B) to

zero and the RC constant (TIMA,B) pins to zero when the RC constant (TIMA,B) inputs reach 2/3 of VREF as shown.

VREF is the voltage on pin 44, which is either 5V or 3.3V. See the “VREF Pin “ section.

JOYR

Joystick 1 Button 1

Joystick 1 Button 2

556

OUT1A

OUT1B

TRIG1A

TRIG1B

X-Axis

Y-Axis

TIM1A

TIM1B

JOYW

Vcc = 5V

Internal To LPC47M192

Joystick 1

556

OUT2A

OUT2B

TRIG2A

TRIG2B

X-Axis

Y-Axis

TIM2A

TIM2B

Vcc = 5V

Joystick 2

Joystick 2 Button 1

Joystick 2 Button 2

J1B1

J1B2

J2B1

J2B2

J1X

J1Y

J2X

J2Y

Game Port

Vcc = 5V

Internal To Joysticks

LPC47M192 Datasheet(PDF) 126 Page - SMSC Corporation

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