General Description

The HT47C20L 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 system in particular.

Features

• Operating voltage: 1.2V~2.2V

• 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 32768Hz crystal oscillator

• Watchdog Timer

• 2Kx16 program memory ROM

• 64x8 data memory RAM

• One real time clock (RTC)

• One 8-bit prescaler for real time clock

• One buzzer output

• One low voltage detector

• One low voltage reset circuit

• HALT function and wake-up feature reduce power consumption

• LCD bias C type

• One LCD driver with 20x2 or 20x3 or 19x4 segments

• Two channels RC type A/D converter

• Four-level subroutine nesting

• Bit manipulation instruction

• 16-bit table read instruction

• Up to 122μs instruction cycle with 32768Hz system clock

• All instructions in one or two machine cycles

• 63 powerful instructions

• 64-pin QFP package