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The AM4G series is a low-cost, high performance 1-channel voice synthesizer with a powerful 4-bit
microprocessor. There are various features including the 4-bit ALU, ROM, RAM, I/O ports, timers, interrupt, clock generator, voice synthesizer, current D/A, and direct-drive outputs, etc. Watchdog timer (WDT), low voltage detector (LVDT), and infrared ray transmitter (IR) features improve system cost and reliability. Large current outputs and constant current outputs make the AM4G’s application diversified. Furthermore, with CMOS technology, the HALT and STB functions can minimize power dissipation.

The RISC MCU architecture is very easy to program and control. There are 67 instructions in the AM4G series,and most of them are executed in only single cycle. The powerful instruction set makes users developing easily and quickly. There are two superior voice synthesizing algorithms: CBR and VBR. Both of them perform very high quality voice even if the bit rate is very low, users can therefore optimize their sound quality or ROM usage easily. The AM4G is also equipped variety choice of the audio outputs with fine resolution, including a current D/A (DAC or Cout), and a direct-drive (PWM).