HOLTEK HT66F40-28SSOP

The HT66FXX series MCUs are A/D type Flash microcontrollers featuring an 8-bit high-performance RISC architecture. This series offers a comprehensive set of functions and features, with re-programmable Flash memory providing users with significant convenience. In terms of memory, the devices also include RAM data memory and True EEPROM memory for storing non-volatile data such as serial numbers and calibration data.

For analog features, these MCUs integrate a multi-channel 12-bit A/D converter and dual comparator functionality. Multiple flexible timer modules are provided, offering timing, pulse generation, and PWM generation capabilities. Built-in SPI and I2C interfaces provide designers with easy communication with external hardware. Internal protection features — including a watchdog timer, low-voltage reset, and low-voltage detection — combined with excellent noise immunity and ESD protection, ensure reliable operation in harsh EMI environments.

These MCUs offer a rich selection of oscillator options — HXT, LXT, ERC, HIRC, and LIRC — with a fully integrated system oscillator requiring no external components. The ability to dynamically switch between different operating modes gives users a means to optimize MCU operation and reduce power consumption.

The HT66FUx0 series MCUs incorporate a UART module, supporting applications such as data communication networks between MCUs, low-cost data links between PCs and peripherals, and communication between portable and battery-powered devices.

Additional features such as timebase functionality and flexible I/O make these MCUs suitable for a wide range of applications.

• Operating voltage: fSY = 8MHz: 2.2V~5.5V; fSY = 12MHz: 2.7V~5.5V; fSY = 20MHz: 4.5V~5.5V
• VDD = 5V, instruction cycle of 0.2μs at 20MHz system clock
• Halt and wake-up functions for reduced power consumption
• Five oscillator modes: External crystal – HXT; External 32.768kHz crystal – LXT; External RC – ERC; Internal RC – HIRC; Internal 32kHz RC – LIRC
• Multiple operating modes: Normal, Slow, Idle, and Sleep
• Built-in 4MHz, 8MHz, and 12MHz oscillators, no external components required
• All instructions executed in 1 or 2 instruction cycles
• Table lookup instruction
• 61 instructions
• Up to 12-level stack
• Bit manipulation instructions
• 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 ports
• 4 software-controlled SCOM ports for 1/2 bias LCD driving
• Multiple pins shared with external interrupt ports
• Multiple timer modules for time measurement, input capture, compare match output, PWM output, and single pulse output
• Serial interface module – SIM for SPI or I2C communication
• Dual comparator function
• Dual time base function with fixed-interval interrupt signal generation
• Multi-channel 12-bit resolution ADC
• Low voltage reset function
• Low voltage detection function
• Optional peripheral – UART module for full-duplex asynchronous communication
• Multiple package types
• Flash program memory endurance: up to 10,000 write cycles
• Flash program memory data retention: over 10 years
• True EEPROM data memory endurance: up to 100,000 write cycles
• True EEPROM data memory data retention: over 10 years

• Electronic measuring instruments
• Environmental monitoring
• Handheld measurement tools
• Home appliances
• Electronic control tools
• Motor control