General Description
The HT46R01/HT46R02/HT46R03 are 8-bit high performance, RISC architecture microcontroller devices specifically designed for a wide range of applications. In addition to providing the usual microcontroller I/O control functions, the fully integrated A/D converter allows the interfacing and processing of external analog signals such as those from sensors.

FEATUREs
Operating voltage:
  fSYS= 4MHz: 2.2V~5.5V
  fSYS= 8MHz: 3.3V~5.5V
  fSYS= 12MHz: 4.5V~5.5V
7 bidirectional I/O lines and 1 input line
External interrupt input shared with an I/O line
One or two 8-bit programmable Timer/Event Counters with overflow interrupt and 7-stage prescaler
External crystal system oscillator
Fully integrated internal RC oscillator available with three frequencies: 4MHz, 8MHz or 12MHz
Watchdog Timer function
PFD for audio frequency generation
Power down and wake-up functions to reduce power consumption
Up to 0.33s instruction cycle with 12MHz system clock at VDD=5V
4, 6 or 8-level subroutine nesting
4-channel 8, 9 or 12-bit resolution A/D converter
8-bit PWM output shared with I/O line
Bit manipulation instruction
Table read instructions
63 powerful instructions
All instructions executed in one or two machine cycles
Low voltage reset function
10-pin ultra-small MSOP package