General Description
   The HT46R74D-1 is an 8-bit high performance, RISC architecture microcontroller device specifically designed for A/D with LCD applications that interface directly to analog signals, such as those from sensors. The advantages of low power consumption, I/O flexibility, timer functions, oscillator options, Dual slope A/D converter, LCD display, HALT and wake-up functions, watchdog timer, as well as low cost, enhance the versatility of these devices to suit for a wide range of AD with LCD application possibilities such as sensor signal processing, scales, consumer products, subsystem controllers, etc.

FEATUREs
• Operating voltage:
   fSYS = 4MHz: 2.2V~5.5V
   fSYS = 8MHz: 3.3V~5.5V
• 10 bidirectional I/O lines and two ADC inputs
• Two external interrupts inputs shared with I/O lines
• One 8-bit and one 18-bit programmable timer/event
   counter with overflow interrupt and pre-scaler
• LCD driver with 154, 163 or 162 segments
• 4K15 program memory with partial lock function
• 968 data memory RAM
• Single differential input channel dual slope Analog to
   Digital Converter with Operational Amplifier.
• Watchdog Timer with regulator power
• Buzzer output
• External 32768Hz RTC oscillator
• Integrated RC or crystal oscillator
• Power-down and wake-up functions reduce power
   consumption
• Internal 3.3V Voltage regulator and charge pump
• Embedded voltage reference generator - 1.5V
• 6-level subroutine nesting
• Bit manipulation instruction
• 15-bit table read instruction
• Up to 0.5s instruction cycle with 8MHz system clock
   at VDD=5V
• 63 powerful instructions
• All instructions in 1 or 2 machine cycles
• Low voltage reset/detector function
• 56-pin SSOP package