The devices are OTP type 8-bit high performance RISC architecture microcontrollers, designed for cost-effective product applications.

For memory features, the device is supplied with One-Time Programmable, OTP memory. Other memory includes an area of RAM Data Memory.

Analog features include a multi-channel 8-bit A/D converter function and two extremely flexible Timer/Event Counters. 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 and 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 optimize microcontroller operation and minimize power consumption.

The inclusion of flexible I/O programming features, Time-Base function along with many other features ensure that the devices will find excellent use in small home appliances, such as hair straightener, electronic cooker, electric fan, soybean milk machine, charger, vacuum cleaner, etc.

CPU Features

• Operating voltage: fSYS =8MHz: 2.0V~5.5V
• Up to 0.5μs instruction cycle with 8MHz system clock at VDD =5V
• Power down and wake-up functions to reduce power consumption
• Oscillator types
• - Internal High Speed 8MHz 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
• 2-level subroutine nesting
• Bit manipulation instruction

Peripheral Features

• OTP Program Memory: (1K-16)×14
• Data Memory: 64×8
• OTP ROM Parameter Program – ORPP
• Watchdog Timer function
• Up to 14 bidirectional I/O lines
• Single external interrupt line shared with I/O pin
• Single 8-bit programmable Timer/Event Counter with PWM output
• - 8-channel PWM function with three kinds of independently adjustable duty cycle
• Single 16-bit programmable Timer/Event Counter
• Single Time-Base function for generation of fixed time interrupt signals
• Low voltage reset function
• 5 external channel 8-bit resolution A/D converter (only for HT66R003)

Specification:

• max. frequency: 8MHz
• VDD: 2.0V~5.5V
• program memory: 1Kx14
• data memory: 64x8
• stack: 2
• I/O: 14
• timer: 8-bit x1, 16-bit ×1
• ADC: 8-bit x5
• PWM: 8-bit x3
• case: 8SOP