Description
The CXP402 is a CMOS 4-bit single chip microcomputer which consists of 4-bit CPU, ROM, RAM, 8-bit timer, 8-bit timer/counter, 18-bit time-base timer, LCD controller/driver, digital signal processor circuit for CD player, 1-bit DAC and the like.

Features
• Instruction cycle 1.89µs for 16.93MHz oscillation
• ROM capacity 6144 × 8 bits
• RAM capacity 400 × 4 bits (Including stack and display area)
• LCD controller/driver (Enables to direct drive)
• 8-bit timer, 8-bit timer/event counter and 18-bit time-base timer are incorporated; they are independently controllable.
• Arithmetic and logical operations between the entire RAM area, I/O area and the accumulator by means of the memory mapped I/O.
• Entire ROM area can be referred by the table lookup instruction.

Digital Signal Processor (DSP) Block
• Playback mode supporting CAV (Constant Angular Velocity)
• Frame jitter free
• Allows relative rotational velocity readout
• Supports spindle external control
• Wide capture range playback mode
• Spindle rotational velocity following method
• 16K RAM
• EFM data demodulation
• Enhanced EFM frame sync signal protection
• SEC strategy-based error correction
• Subcode demodulation and Sub Q data error detection
• Digital spindle servo
• 16-bit traverse counter
• Asymmetry correction circuit
• Servo auto sequencer
• Digital audio interface output
• Digital peak meter

Digital Filter, DAC and Analog Low-Pass Filter Blocks
• DBB (digital bass boost) function
• Digital de-emphasis
• Digital attenuation
• Zero detection function
• 8Fs oversampling digital filter
• S/N: 100dB or more (master clock: 384Fs, typ.) Logical value: 109dB
• THD + N: 0.007% or less (master clock: 384Fs, typ.)
• Rejection band attenuation: –60dB or more
• 112-pin plastic LQFP
• Piggyback package (CXP401Z) available