The HT66FXX series of devices are Flash Memory A/D 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 true EEPROM memory for storage of nonvolatile data such as serial numbers, calibration data etc.

Analog features include a multi-channel 12-bit A/D converter and dual comparator functions. Multiple and extremely flexible Timer Modules provide timing, pulse generation and PWM generation functions. Communication with the outside world is catered for by including fully integrated SPI or I²C interface functions, two popular interfaces which provide designers with a means of easy communication with external peripheral hardware. Protective features such as an internalWatchdog 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, ERC, 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 minimise power consumption.

The UART module is contained in the HT66FUx0 series of devices. It can support the applications such as data communication networks between microcontrollers, low-cost data links between PCs and peripheral devices, portable and battery operated device communication, etc.

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 = 20MHz: 4.5V~5.5V
• Up to 0.2μs instruction cycle with 20MHz system clock at VDD =5V
• Power down and wake-up functions to reduce power consumption
• Five oscillators:
  • External Crystal - HXT
  • External 32.768kHz Crystal - LXT
  • External RC - ERC
  • Internal RC - H©IRC
  • Internal 32kHz RC - LIRC
• Multi-mode operation: NORMAL, SLOW, IDLE and SLEEP
• Fully integrated internal 4MHz, 8MHz and 12MHz oscillator requires no external components
• All instructions executed in one or two instruction cycles
• Table read instructions
• 61 powerful instructions
• Up to 12-level subroutine nesting
• Bit manipulation instruction

Peripheral Features

• Flash Program Memory: 1K×14~12K×16
• RAM Data Memory: 64×8~576×8
• True EEPROM Memory: 32×8~256×8
• Watchdog Timer function
• Up to 50 bidirectional I/O lines
• Software controlled 4-SCOM lines LCD driver with 1/2 bias
• Multiple pin-shared external interrupts
• Multiple Timer Module for time measure, input capture, compare match output, PWM output or single pulse output function
• Serial Interfaces Module -- SIM for SPI or I²C
• Dual Comparator functions
• Dual Time-Base functions for generation of fixed time interrupt signals
• Multi-channel 12-bit resolution A/D converter
• Low voltage reset function
• Low voltage detect function
• Optional peripheral -- UART module for fully duplex asynchronous communication
• Wide range of available package types
• Flash program memory can be re-programmed up to 10,000 times
• Flash program memory data retention > 10 years
• True EEPROM data memory can be re-programmed up to 100,000 times
• True EEPROM data memory data retention > 10 years

Specification:

• max. frequency: 20MHz
• VDD: 2.2V~5.5V
• program memory: 4Kx15
• data memory: 192x8
• data EEPROM: 128x8
• stack: 8
• I/O: 42
• timer: 10-bit CTM×1, 10-bit ETM×1, 16-bit STM×1
• comparator: 2
• interface: SPI/I²C×1
• case: 28SOP