General Description
The HT47C20 is an 8-bit high performance RISC-like microcontroller. Its single cycle instruction and two-stage pipeline architecture make high speed applications. The device is suited for use in multiple LCD low power applications among which are calculators, clock timers, games, scales, toys, thermometers, hygrometers, body thermometers, capacitor scaler, other hand held LCD products, and battery systems in particular.

Features
• Operating voltage: 2.4V~3.6V
• Eight bidirectional I/O lines
• Four input lines
• One interrupt input
• One 16-bit programmable timer/event counter with PFD (programmable frequency divider) function
• On-chip crystal and RC oscillator for system clock
• One 32.768kHz crystal oscillator for real time clock
• Watchdog Timer
• 2Kx16 program memory ROM
• 64x8 data memory RAM
• One Real Time Clock (RTC)
• One 8-bit prescaler for RTC
• One buzzer output
• HALT function and wake-up feature reduce power consumption
• LCD bias C type
• One LCD driver with 20x3 or 19x4 segments
• One 38kHz or 40kHz IR carrier output (455kHz or 480kHz system clock only)
• Two channels RC type A/D converter
• Four-level subroutine nesting
• Bit manipulation instruction
• 16-bit table read instruction
• Up to 8.3μs instruction cycle with 480kHz system clock
• All instructions in one or two machine cycles
• 63 powerful instructions
• 64-pin QFP package