General Description
The HT46R4A is a device from the Cost-Effective A/D Type Series of MCUs. As an 8-bit high performance RISC architecture microcontroller, the device is designed especially for applications that interface directly to analog signals, such as those from sensors. The devices include an integrated multi-channel Analog to Digital Converter in addition to two Pulse Width Modulation outputs.
   
Features
• Operating voltage:
    fSYS=4MHz: 2.2V~5.5V
    fSYS=8MHz: 3.3V~5.5V
• Max of 27 bidirectional I/O lines
• External interrupt input shared with I/O line
• Two 8-bit programmable Timer/Event Counters with
    overflow interrupt
• Integrated crystal and RC oscillator
• Watchdog Timer
• 409x15 program memory
• 192x8 data memory
• PFD for audio frequency generation
• Power down and wake-up functions to reduce power
    consumption
• Up to 0.5μs instruction cycle with 8MHz system clock
    at VDD=5V
• 6-level subroutine nesting
• 6 channel 9-bit resolution A/D converter
• Dual channel 8-bit PWM output shared with I/O lines
• Bit manipulation instruction
• Table read instructions
• 63 powerful instructions
• All instructions executed in one or two machine
    cycles
• Low voltage reset function
• 28-pin SKDIP/SOP, 32-pin DIP, 44-QFP package