General Description
The HT47R20A-1/HT47C20-1 are 8-bit, high performance, RISC architecture microcontroller devices specifically designed for applications that interface directly to analog signals, such as those from sensors. The mask version HT47C20-1 is fully pin and functionally compatible with the OTP version HT47R20A-1 device.

Features
• Operating voltage: 2.2V~5.5V
• 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 or system clock
• Watchdog Timer
• 2Kx16 program memory
• 64x8 data memory RAM
• One Real Time Clock (RTC)
• One 8-bit prescaler for RTC
• One low voltage detector
• One low voltage reset circuit
• One buzzer output
• HALT function and wake-up feature reduce power consumption
• LCD bias C type or R type
• One LCD driver with 20x2,20x3 or 19x4 segments
• One IR carrier output
• Two channels RC type A/D converter
• Four-level subroutine nesting
• Bit manipulation instruction
• 16-bit table read instruction
• Up to 1μs instruction cycle with 4MHz system clock
• All instructions in one or two machine cycles
• 63 powerful instructions
• 64-pin LQFP package