The HT67F2452 is a Flash Memory A/D 8-bit high performance RISC architecture microcontroller with LCD driver designed for a wide range of applications that interface directly to analog signals and require a LCD display.

For memory features, the Flash Memory offers users the convenience of multi-programming features. Other memory includes an area of RAM Data Memory as well as an area of true EEPROM memory for storage of non-volatile data such as serial numbers, calibration data etc. By using the In Application Programming technology, users have a convenient means to directly store their measured data in the Flash Program Memory as well as having the ability to easily update their application programs.

Analog features include a multi-channel 12-bit A/D converter function. 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 UART interface function, this popular interface which provides designers with a means of easy communication with external peripheral hardware. 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 external, internal, high and low oscillator is provided including two fully integrated system oscillators which require 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 inclusion of both LCD and LED driver functions allows for easy and cost effective solutions in applications that require interface to these display types.

The inclusion of flexible I/O programming features, Time-Base functions along with many other features ensure that the device will find excellent use in applications such as LCD remote controller, electronic metering, environmental monitoring, handheld instruments, household appliances, electronically controlled tools, motor driving in addition to many others.

CPU Features

• Operating voltage: fSYS =4MHz: 1.8V~5.5V
• Up to 1μs instruction cycle with 4MHz system clock at VDD =5V
• Power down and wake-up functions to reduce power consumption
• Oscillators
  • External High Speed Crystal – HXT
  • External Low Speed 32.768kHz Crystal – LXT
  • Internal High Speed 4MHz RC – HIRC
  • Internal 32.768kHz RC – LIRC
• Fully integrated internal oscillators require no external components
• Multi-mode operation: FAST, SLOW, IDLE and SLEEP
• All instructions executed in 1~3 instruction cycles
• Table read instructions
• 115 powerful instructions
• 8-level subroutine nesting
• Bit manipulation instruction

Peripheral Features

• Flash Program Memory: 8K×16
• RAM Data Memory: 512×8
• True EEPROM Memory: 128×8
• In Application Programming – IAP
• Watchdog Timer function
• Up to 44 bidirectional I/O lines
• High driver current output pin for IR LED applications
• LCD Driver function
  • SEGs×COMs: 30×4, 29×5 or 28×6
  • Duty type: 1/4 duty, 1/5 duty or 1/6 duty
  • Bias level: 1/3 bias
  • Bias type: R type or C type
  • Waveform type: type A or type B
• Programmable I/O source current for LED applications
• Four external interrupt lines shared with I/O pins
• Multiple Timer Modules for time measurement, input capture, compare match output, PWM output function or single pulse output function
• Single fully-duplex Universal Asynchronous Receiver and Transmitter Interface – UART
• Dual Time Base functions for generation of fixed time interrupt signals
• 8 external channel 12-bit resolution A/D converter with Internal Reference Voltage VR
• Low Voltage Reset function – LVR
• Low Voltage Detect function – LVD
• Package types: 32/44/48-pin LQFP

Specification:

• max. frequency: 4MHz
• VDD: 1.8V~5.5V
• program memory: 8Kx16
• data memory: 512x8
• data EEPROM: 128x8
• stack: 8
• I/O: 44
• timer: 10-bit CTM×1, 10-bit PTM×1, 16-bit STM×1
• ADC: 12-bitx8
• LCD: 30×4, 29×5, 28×6
• interface: UARTx1
• case: 44LQFP