CS4237B Datasheet, PDF (103/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

CS4237B
Joystick/DSP Serial Port Interface
JACX, JACY - Joystick A Coordinates, Input
These pins and are the X/Y coordinates for Joystick A. They should have a 5.6nF capacitor to
ground and a 2.2kΩ resistor to the joystick connector pins 3 and 6, respectively.
JAB1, JAB2 - Joystick A Buttons, Input
These pins are the switch inputs for Joystick A. They should be connected to joystick connector
pins 2 and 7, respectively; as well as have a 1nF capacitor to ground, and a 4.7kΩ pullup
resistor.
JBCX/SDOUT - Joystick B Coordinate X/Serial Data Output, Input/Output
When this pin is used as a second joystick, it is the X coordinates input for Joystick B; and
should have a 5.6nF capacitor to ground and a 2.2kΩ resistor to the joystick connector pin 11.
When the serial port is enabled, SPE = 1 in I16, this pin is the serial data output. The DSP
serial port SDOUT pin can be switched to XD3 via the SPS bit. This would facilitate using the
DSP serial port and the second joystick simultaneously.
JBCY/SDIN - Joystick B Coordinate Y/Serial Data Input, Input
When this pin is used as a second joystick, it is the Y coordinates input for Joystick B; and
should have a 5.6nF capacitor to ground and a 2.2kΩ resistor to the joystick connector pin 13.
When the serial port is enabled, SPE = 1 in I16, this pin is the serial data input. The DSP serial
port SDIN pin can be switched to XD2 via the SPS bit. This would facilitate using the DSP
serial port and the second joystick simultaneously.
JBB1/FSYNC - Joystick B Button 1/Frame Sync, Input/Output
When this pin is used as a second joystick, it is the switch 1 input for Joystick B; and should be
connected to joystick connector pin 10; as well as have a 1nF capacitor to ground, and a 4.7kΩ
pullup resistor. When the serial port is enabled, SPE = 1 in I16, this pin is the serial frame sync
output. The DSP serial port FSYNC pin can be switched to XD4 via the SPS bit. This would
facilitate using the DSP serial port and the second joystick simultaneously.
JBB2/SCLK - Joystick B Button 2/Serial Clock, Input/Output
When this pin is used as a second joystick, it is the switch 2 input for Joystick B; and should be
connected to joystick connector pin 14; as well as have a 1nF capacitor to ground, and a 4.7kΩ
pullup resistor. When the serial port is enabled, SPE = 1 in I16, this pin is the serial clock
output. The DSP serial port SCLK pin can be switched to XD1 via the SPS bit. This would
facilitate using the DSP serial port and the second joystick simultaneously.
DS213PP4
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