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

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 applications such as electronic metering, environmental monitoring, handheld instruments, household appliances, electronically controlled tools, motor driving in addition to many others.

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
• Watchdog Timer function
• Up to 8 bidirectional I/O lines
• Single external interrupt line shared with I/O pin
• Single 8-bit programmable Timer/Event Counter with PWM output
• Single 16-bit programmable Timer/Event Counter
• Single Time-Base function for generation of fixed time interrupt signals
• Low voltage reset function
• 4 external channel 8-bit resolution A/D converter (only for HT66R002)

Specification:

• max. frequency: 8MHz
• VDD: 2.0V~5.5V
• program memory: 1Kx14
• data memory: 64x8
• stack: 2
• I/O: 8
• timer: 8-bit x1, 16-bit ×1
• ADC: 8-bit x4
• PWM: 8-bit x1
• case: 10SOP