General Description
The HT46R321 is 8-bit, high performance, RISC architecture microcontroller devices. With their fully integrated A/D converter they are especially suitable for applications which interface to analog signals, such as those from sensors. The addition of an internal operational amplifier/comparator and PWM modulation functions further adds to the analog capability of these devices.

Features
• Operating voltage:
    fSYS=4MHz: 2.2V~5.5V
    fSYS=8MHz: 3.3V~5.5V
• 21 bidirectional I/O lines (max.)
• support 84 LED driver
• Single interrupt input shared with an I/O line
• 8-bit programmable timer/event counter with overflow interrupt
• Integrated crystal and RC oscillator
• Watchdog Timer
• 204815 Program Memory capacity
• 888 Data Memory capacity
• Integrated PFD function for sound generation
• Power-down and wake-up functions reduce power consumption
• Up to 0.5μs instruction cycle with 8MHz system clock at VDD=5V
• 6-level subroutine nesting
• 6 channel 12-bit resolution A/D converter
• Integrated single operational amplifier or comparator selectable via configuration option
• Peripheral clock output  PCK
• Dual 8-bit PWM outputs shared with I/O lines
• Bit manipulation instruction
• Full table read instruction
• 63 powerful instructions
• All instructions executed in one or two machine cycles
• Low voltage reset function
• 28-pin SKDIP/SOP/SSOP packages