"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?
They seem to be after the gadget market - cell phones, toys, etc.
ReplyDeleteThere is a bunch of audio chips - converters, speech synthesizers, and wavetable synthesizers with up to 16 voices.
I'd be a little concerned about pitch precision and sampling artifacts, but it looks like a DIY treasure trove. Would their agents sell small quantities to individuals or only big orders to companies?