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SAA7824 Datasheet(PDF) 36 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 36 Page - NXP Semiconductors |
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36 / 89 page  2003 Oct 01 36 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 7.17 Microcontroller interface Communication on the microcontroller interface can be set-up in three different modes: • 4-wire bus mode: where: – SCL = serial clock – SDA = serial data – RAB=R/W control and data strobe (active HIGH) for writing to decoder registers 0 to F, reading status bit selected via decoder register 2 and reading Q-channel subcode – SILD = R/W control and data strobe (active LOW) for servo commands • 3-wire bus mode: where: – SCL = serial clock – SDA = serial data – RAB = not used, pulled LOW – SILD = R/W control and data strobe (active LOW) for servo commands • I2C-bus mode: I2C-bus protocol where the SAA7824 behaves as slave device, activated by setting RAB = HIGH and SILD = LOW where: –I2C-bus slave address (write mode) = 30H – I2C-bus slave address (read mode) = 31H – Maximum data transfer rate = 400 kbits/s. It should be noted that when using the I2C-bus mode, only servo commands can be used. Therefore, writing to decoder registers 0 to F, reading decoder status and reading Q-channel subcode data must be performed by servo commands. The 3-wire mode is very similar to the 4-wire mode, except that all communication to the decoder is via the servo. Communication to the servo uses the same hardware protocol and timing as the 4-wire mode. Extra servo commands exist for read and write access to the decoder via the internal decoder interface. The internal interface must be enabled by using the xtra_preset command. RAB is not used and must be tied LOW; see Fig.23 handbook, halfpage MDB502 MICROCONTROLLER INTERFACE (DECODER) MICROCONTROLLER INTERFACE SAA7824 RAB = LOW SDA SCL SILD Fig.23 Microcontroller interface for the 3-wire mode. |
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