HOLTEK
HT47C20L
8-Bit R-F Type Low Voltage Mask MCU
 Features
Operating voltage: 1.2V~2.2V One low voltage reset circuit
Eight bidirectional I/O lines HALT function and wake-up feature reduce power
Four input lines ---consumption
One interrupt input LCD bias C type
One 16-bit programmable timer/event One LCD driver with 20x 2 or 20x 3 or 19x 4 segments-
---counter with PFD (programmable Two channels RC type A/D converter
---frequency  divider) function Four-level subroutine nesting
On-chip 32768Hz crystal oscillator Bit manipulation instruction
Watchdog Timer 16-bit table read instruction
2Kx16 program memory ROM Up to 122us instruction cycle with 32768Hz system
64x8 data memory RAM ---clock
One Real Time Clock (RTC) All instructions in one or two machine cycles
One 8-bit prescaler for real time clock 63 powerful instructions
One Buzzer output One low voltage detector
 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.