CS4341A

DS582PP1

11

3.9

Control Port Interface

The control port is used to load all the internal register settings (see section 5). The operation of the control

port may be completely asynchronous with the audio sample rate. However, to avoid potential interference

problems, the control port pins should remain static if no operation is required.

3.9.1

MAP Auto Increment

The device has MAP (memory address pointer) auto increment capability enabled by the INCR bit

or reads, and SPI writes. If INCR is set to 1, MAP will auto increment after each byte is written,

allowing block reads or writes of successive registers.

3.9.2

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the serial control port clock, SCL (see Figure 6 for the clock to data relationship). There is no CS

pin. Pin AD0 enables the user to alter the chip address (001000[AD0][R/W]) and should be tied to

VA or GND as required, before powering up the device. If the device ever detects a high to low

transition on the AD0/CS pin after power-up, SPI mode will be selected.

3.9.2a

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To write to the device, follow the procedure below while adhering to the control port

Switching Specifications in section 7.

must be 001000. The seventh bit must match the setting of the AD0 pin, and the eighth must

be 0. The eighth bit of the address byte is the R/W bit.

2) Wait for an acknowledge (ACK) from the part, then write to the memory address pointer,

MAP. This byte points to the register to be written.

3) Wait for an acknowledge (ACK) from the part, then write the desired data to the register

pointed to by the MAP.

4) If the INCR bit (see section 3.9.1) is set to 1, repeat the previous step until all the desired

registers are written, then initiate a STOP condition to the bus.

essary to initiate a repeated START condition and follow the procedure detailed from step

1. If no further writes to other registers are desired, initiate a STOP condition to the bus.