The HT67F2355 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 an 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 SPI, UART or I2C interface functions, the popular interface which provide 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 LED/LCD product applications such as temperature controllers, air conditioner remote controls, electric vehicle meters and household appliance control panels.

Features:

• Operating Voltage
  • fSYS =4MHz: 1.8V~5.5V
  • fSYS =8MHz: 1.8V~5.5V
  • fSYS =12MHz: 2.7V~5.5V
• Up to 0.33μs instruction cycle with 12MHz system clock at VDD =5V
• Power down and wake-up functions to reduce power consumption
• Oscillators
  • External High Speed Crystal – HXT
  • Internal High Speed 4/8/12MHz RC – HIRC
  • External Low Speed 32.768kHz Crystal – LXT
  • Internal 32kHz 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: 512×8
• In Application Programming – IAP
• Watchdog Timer function
• Up to 46 bidirectional I/O lines
• LCD Driver function
  • SEGs×COMs: 32×4, 31×5, 30×6 or 28×8
  • Duty type: 1/4 duty,1/5 duty, 1/6 duty or 1/8 duty
  • Bias level: 1/2 bias, 1/3 bias or 1/4 bias
  • Bias type: R 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, compare match output, PWM output function or single pulse output function
• Serial Interface Module – SIM includes SPI and I2C interfaces
• Single Fully-duplex or Half-duplex Universal Asynchronous Receiver and Transmitter Interface– UART
• Dual Time Base functions for generation of fixed time interrupt signals
• 10 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: 44/48-pin LQFP

Specification:

• max. frequency: 12MHz
• VDD: 1.8V~5.5V
• program memory: 8Kx16
• data memory: 512x8
• data EEPROM: 512x8
• stack: 8
• I/O: 46
• timer: 10-bit CTM×3, 10-bit PTM×1
• ADC: 12-bitx10
• LCD: 32x4, 31x5, 30x6, 28x8
• comparator: -
• interface: UARTx1, SPI/I²C×1
• case: 44LQFP