General Description - Holtek HT66F20 Manual

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM

General Description

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 non-
volatile 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 I
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.
Rev. 2.50
C interface functions, two popular interfaces which provide designers with a
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