General Description
The HT45FM03B is 8-bit, high performance, RISC architecture microcontroller device which includes a host of fully integrated special features specifically designed for brushless DC motor applications.

Features
• Operating voltage: fSYS= 0.4~20MHz: 4.5V~5.5V
• 26 bidirectional I/O lines
• External interrupt inputs shared with 4 I/O lines
• 8-bit programmable Timer/Event Counter with overflow interrupt and 7-stage prescaler
• 16-bit programmable Timer/Event Counter with overflow interrupt and 7-stage prescaler
• 4096x15 Flash Program Memory
• 192x8 Data Memory RAM
• On-chip crystal, internal RC and external RC oscillator
• Fully integrated internal RC oscillator with three fixed frequencies: 12MHz, 16MHz or 20MHz
• Watchdog Timer function
• PFD for audio frequency generation
• Power down and wake-up functions to reduce power consumption
• Up to 0.2μs instruction cycle with 20MHz system clock at VDD=5V
• 8-level subroutine nesting
• 8 channel 12-bit resolution A/D converter
• 3 pairs of 10-bit PWM with complementary outputs shared with six I/O lines and with 3 PWM duty control registers
• Bit manipulation instruction
• Table read instructions
• 63 powerful instructions
• All instructions in one or two machine cycles
• Low voltage reset function
• Low voltage detect function
• Integrated operational Amplifier
• Integrated Analog Comparator with interrupt function
• Flash program memory can be re-programmed yp to 100,000 times
• Flash program memory data retention > 10 years
• ICP (In-Circuit Programming) interface
• 28-pin SOP package