General Description
The HT827A0 is 8-bit high performance microcontroller with a voice synthesizer and tone generator. They are designed for applications on multiple I/Os with sound effects. The LSIs provide 26 kinds of voice sampling rates, 4 octaves of tone level as well as a high quality of current type D/A output. With such a flexible structure, the HT827A0 is excellent for versatile voice and sound effect product applications. It also includes a halt function to reduce power consumption.

Features
8-bit microcontroller
• Operating voltage: 2.4V~5.2V
• 8Kx16 program ROM
• 208x8 data RAM
• 36 bidirectional I/O lines
• Interrupt input
• 16-bit programmable timer/event counter with overflow interrupts
• Watchdog timer
• On-chip crystal or RC types of oscillator
• Halt function and wake-up feature reduces power consumption
• 63 powerful instructions
• Up to a 1μs instruction cycle with a 4MHz system clock at VDD=5V
• All instructions in 1 or 2 machine cycles
• 16-bit table read instruction
• 8-level subroutine nesting
• Bit manipulation instruction

Voice and melody synthesizer
• 128Kx8 voice ROM
• 3/4 bit ADPCM coding algorithm
• 26 kinds of voice sampling rates
• Tone level of 4 octaves
• 14 kinds of melody beats
• Current type of D/A switch output
• Tone generator counter
• Controllable volume
• 48-pin DIP package

Applications
• Intelligent educational toys
• High end toy controllers
• Talking alarm clocks
• Alert and warning systems
• Public address systems
• Sound effect generators