TDA7522

`BUILT IN 8Bit MICROCONTROLLER (STANDARD ST7) with:
    24 KByte ROM available for ST7 & Servo-Audio DSP
    1024Byte RAM, including 128byte stack
    4KByte RAM for CD-Text memory (for 1block)
    Built in R-W subcode buffer (Max. 144Byte 8packs) for CD-Text
    24 bit general I/O port (PoartA[7-0], PortB[7-0], PortC[7-0])
    One External Interrupt (16 IRQ encoder inside)
    16bit free running counter timer
    8bit 1ch general purpose A/D
    I<sup>2</sup>C bus I/F
    Watch dog
    Kenwood I/F
` STAND-BY MODE (Stop all clocks and Shut down power of Peripheral (PON pin))
` BUILT IN SERVO & AUDIO DIGITAL SIGNAL PROCESSOr (SAC-DSP) inclusive of:
    1024x19bit Program RAM
    512x16bit Coefficient RAM
    1024x20bit Data RAM
    128x6bit Decimation RAM
    MAC: 16 bit (Coefficients) x 20 bit (data) multiplier with 38 bit adder
    Instruction execution rate as high as 56MIPS
` BUILT IN PROGRAMMABLE CLOCK GENERATOR PLL
` PERIPHERALS for CD PLAYER APPLICATION
    Data Acquisition, Erasure correction, CLV&CAV controller
    Subcode decoder (CD-Text, CD-Graphic I/F)
    Shock proof memory controller, Disturbance detector
    Decimation filter
` ACTUATORS DRIVING MODE SELECTABLE between PWM or PDM MODE
` 256Fs / 384Fs (16.9344MHz) CLOCK INPUT.

TDA7522 is a single chip processor consisting of Decoder, Servo and 1bit D/A for 4times CD-ROM / CDAudio.
Main concept of this IC is that it is based on embedded System Micro Controller which allows customer to develop system software very easily: just based on provided commands. Further the microcontroller is fully customer dedicated in terms of both software and general purpose Port.

By combination of ST Analog front-end IC (TDA7521), all CD functions including Shock Proof Memory Controller and CD-Text function can be realized.
The TDA7522 portfolio is constituted by three different versions:
'development': which gives the possibility to have at disposal the complete sw development environment, by   means of a dedicated package
'in field development'of the TDA7522: standard package but with selection of program memory: on chip RAM, on chip ROM. The program RAM is fully patchable through the standard IIC interface, giving the possibility of sw changing while chip is working in the real environment.
'production': standard package, but with software permanently stored in the on chip ROM.