"The HT36A4 is an 8-bit high performance RISC-like microcontroller specifically designed for music applications. It provides an 8-bit MCU and a 8 channel wavetable synthesizer. The program ROM is composed of both program control codes and wavetable voice codes, and can be easily programmed.
The HT36A4 has a built-in 8-bit microprocessor which programs the synthesizer to generate the melody by setting the special register from 20H~2AH. A HALT feature is provided to reduce power consumption.
Features
* Operating voltage: 2.4V~5.0V
* Operating frequency: 3.58MHz~12MHz (typ. 8MHz)
* 8 bidirectional I/O lines
* Two 8-bit programmable timer with 8 stage prescaler
* Watchdog Timer
* Built-in 8-bit MCU with 208×8 bits RAM
* Built-in 32K×16-bit ROM for program/data shared
* Mono output
* High D/A converter resolution: 16 bits
* Polyphonic up to 8 notes
* Independent volume mix can be assigned to each sound component
* Sampling rate of 25kHz as 6.4MHz for system frequency
* Eight-level subroutine nesting
* HALT function and wake-up feature to reduce power consumption
* Bit manipulation instructions
* 16-bit table read instructions
* 63 powerful instructions
* All instructions in 1 or 2 machine cycles
* 16-pin DIP/SOP package"
Click here for the product page.
Anyone know what these are used in or if anyone has done any DIY work with them?