The devices are Flash Memory type 8-bit high performance RISC architecture microcontrollers. Offering users the convenience of Flash Memory multi-programming features, these devices also include a wide range of functions and features. Other memory includes an area of RAM Data Memory as well as an area of EEPROM memory for storage of non-volatile data such as serial numbers, calibration data etc.

Analog features include a multi-channel 12-bit A/D converter function. Extremely flexible Timer Modules provide timing, pulse generation and PWM generation functions. Protective features such as an internal Watchdog Timer, Low Voltage Reset and Low Voltage Detector coupled with excellent noise immunity and ESD protection ensure that reliable operation is maintained in hostile electrical environments.

A full choice of HXT, LXT, HIRC and LIRC oscillator functions are provided including a fully integrated system oscillator which requires no external components for its 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 minimize power consumption.

The inclusion of flexible I/O programming features, Time-Base functions 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: 2.2V~5.5V
  • fSYS =12MHz: 2.7V~5.5V
  • fSYS = 16MHz: 3.3V~5.5V
  • fSYS =20MHz: 4.5V~5.5V
• Up to 0.2us instruction cycle with 20MHz system clock at VDD =5V
• Power down and wake-up functions to reduce power consumption
• Four oscillators:
  • - External Crystal - HXT
  • - External 32.768kHz Crystal - LXT
• (only for HT66F0174)
  • - Internal RC - HIRC
  • - Internal 32kHz - LIRC
• Multi-mode operation: NORMAL, SLOW, IDLE and SLEEP
• Fully integrated internal 8MHz oscillator requires no external components
• All instructions executed in one or two instruction cycles
• Table read instructions
• 63 powerful instructions
• 8-level subroutine nesting
• Bit manipulation instruction

Peripheral Features

• Flash Program Memory: 2Kx16
• RAM Data Memory: 128x8
• EEPROM Memory: 64x8 (only for HT66F0174)
• Watchdog Timer function
• 18 bidirectional I/O lines
• Two pin-shared external interrupts
• Two 10-bit PTM
• Dual Time-Base function for generation of fixed time interrupt signal
• 8-channel 12-bit resolution A/D converter
• Low voltage reset function
• Low voltage detect function
• Package types: 20-pin SOP/SSOP

Specification:

• max. frequency: 20MHz
• VDD: 2.2V~5.5V
• program memory: 2Kx16
• data memory: 128x8
• data EEPROM: 64x8
• stack: 8
• I/O: 18
• ADC: 12-bitx8
• timer: 10-bit PTM×2
• case: 20SOP