The devices are OTP type 8-bit high performance RISC architecture microcontrollers, which are designed for various voice application terminal products such as smart home appliances, consumer electronic products, etc.

For memory features, the memory also includes an area of RAM Data Memory as well as an area of up to 8Mbit Voice Flash Memory.

A single extremely flexible Timer/Event Counter provides timing, event counting and pulse wide measurement functions. In addition, an internal LDO function provides power to the Voice Flash Memory. Communication with the outside world is catered for by including fully integrated SPI and I2C interface functions, these popular interfaces which provide designers with a means of easy communication with external peripheral hardware. Protective features such as an internal Watchdog Timer and Low Voltage Reset coupled with excellent noise immunity and ESD protection ensure that reliable operation is maintained in hostile electrical environments.

A full choice of internal high and low speed oscillators are provided, the two fully integrated system oscillators require no external components for their implementation. The ability to operate and switch dynamically between a range of operating modes using different clock sources gives users the ability to optimise microcontroller operation and minimise power consumption.

The devices integrate a Delta Sigma PWM driver, for which the devices have a digital programmable volume control with a wide range. The devices also support the Peripheral IC mode, implementing voice editing together with Holtek Voice MCU Workshop. The inclusion of flexible I/O programming features, Time Base functions, along with many other features ensure that the devices will find excellent use for voice application terminal products.

CPU Features

• operating voltage: fSYS =12MHz: 2.3V~5.5V
• up to 0.33μs instruction cycle with 12MHz system clock at VDD =5V
• power down and wake-up functions to reduce power consumption
• oscillator types
• internal high speed 12MHz RC – HIRC
• internal low speed 32kHz RC – LIRC
• multi-mode operation: FAST, SLOW, IDLE and SLEEP
• fully integrated internal oscillators require no external components
• all instructions executed in one or two instruction cycles
• table read instructions
• 61 powerful instructions
• 8-level subroutine nesting
• bit manipulation instruction

Peripheral Features

• OTP program memory: (2K-16)×16
• RAM data memory: 128×8
• voice flash memory: HT68RV032: 2Mbit; HT68RV033: 4Mbit; HT68RV034: 8Mbit
• watchdog timer function
• 5 bidirectional I/O lines
• one external interrupt line shared with I/O pin
• one 8-bit programmable Timer/Event Counter with overflow interrupt and prescaler
• dual time base functions for generation of fixed time interrupt signals
• Delta Sigma PWM driver
• integrated 3.0V LDO
• serial interface module – SIM for SPI or I2C interface
• low voltage reset function – LVR
• support peripheral IC mode
• package type: 8-pin SOP