General Description
The HT46R23/HT46C23 are 8-bit, high performance, RISC architecture microcontroller devices specifically designed for A/D applications that interface directly to analog signals, such as those from sensors. The mask version HT46C23 is fully pin and functionally compatible with the OTP version HT46R23 device.

FEATUREs
• Operating voltage:
   fSYS=4MHz: 2.2V~5.5V
   fSYS=8MHz: 3.3V~5.5V
• 23 bidirectional I/O lines (max.)
• 1 interrupt input shared with an I/O line
• 16-bit programmable timer/event counter with overflow interrupt and 7-stage prescaler
• On-chip crystal and RC oscillator
• Watchdog Timer
• 4096 X 15 program memory
• 192 X 8 data memory RAM
• Supports PFD for sound generation
• HALT function and wake-up feature reduce power consumption
• Up to 0.5μs instruction cycle with 8MHz system clock at VDD=5V
• 8-level subroutine nesting
• 8 channels 10-bit resolution A/D converter
• 2-channel 8-bit PWM output shared with two I/O lines
• Bit manipulation instruction
• 15-bit table read instruction
• 63 powerful instructions
• All instructions in one or two machine cycles
• Low voltage reset function
• I2C Bus (slave mode)
• 24/28-pin SKDIP/SOP packages