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Stellaris® LM3S9B96 Development Kit User’s Manual
September 5, 2010 19
I
2
S Audio
The LM3S9B96 development board has advanced audio capabilities using an I
2
S-connected
Audio TLV320AIC23 CODEC. The factory default configuration has Audio output (Line Out and/or
Headphone output) enabled. Four additional I
2
S signals are required for Audio input (Line Input
and/or Microphone). All four audio interfaces are through 1/8” (3.5mm) stereo jacks. Table 2-6
shows the I
2
S audio-related signals.
The Audio CODEC has a number of control registers which are configured using the I
2
C bus
signals. CODEC settings can only be written, but not read, using I
2
C. See the StellarisWare™
example applications for programming information and the TLV320AIX23B data sheet for
complete register details.
The Headphone output can be connected directly to any standard headphones. The Line Output is
suitable for connection to an external amplifier, including PC desktop speaker sets.
User Switch and LED
The development board provides a user push-switch and LED (see Table 2-7).
Table 2-6. I
2
S Audio-Related Signals
Microcontroller Pin Board Function Jumper Name
I2C0SDA CODEC Configuration Data SDA
I2C0SCL CODEC Configuration Clock SCL
I2STXSD Audio Out Serial Data TXSD
I2STXWS Audio Out Framing signal TXWS
I2STXSCK Audio Out Bit Clock BCLK
a
a. Shares GPIO line with Analog voltage reference. Jumper installed by default.
I2STXMCLK Audio Out System Clock MCLK
I2SRXSD Audio In Serial Data RXSD
b
b. Shares GPIO line with LCD data bus – Port D. Jumper omitted by default.
I2SRXWS Audio In Framing signal RXWS
b
I2SRXSCK Audio In Bit Clock BCLK
b
I2SRXMCLK Audio In System Clock MCLK
b
Table 2-7. Navigation Switch-Related Signals
Microcontroller Pin Board Function Jumper Name
PJ7 User Switch SWITCH
PF3 User LED LED
a
a. Shared with Ethernet Jack Yellow LED. This jumper is installed by default.
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