Alpha Voice IC
The AM4Exxxxx series are very low cost voice & melody synthesizers with 4-bit microprocessor. They have various features including 4-bit ALU, ROM, RAM, I/O ports, timers, clock generator, voice and melody synthesizer, current D/A and PWM outputs, etc. The audio synthesizer contains one voice-channel and two melody-channels. Furthermore, they consist of 27 instructions in these devices. With CMOS technology and
halt function can minimize power dissipation. Their architectures are similar to RISC, with two stages of instruction pipeline. They allow all instructions to be executed in a single cycle, except for program branches
and data table read instructions (which need two instruction cycles) .