HOLTEK
HT16220
RAM Mapping 32x8 LCD Controller for I/O uC
 Features
Operating voltage: 2.7V~5.2V Built-in LCD display RAM
External Crystal 32.768kHz oscillator R/W address auto increment
1/4 bias, 1/8 duty, frame frequency is 64Hz Two selectable buzzer frequencies(2kHz/4kHz)
Max. 32x8 patterns, 8 commons,32 segments Power down command reduces power consumption
Built-in internal resistor type bias generator Software configuration feature
3-wire serial interface Data mode and Command mode instructions
8 kinds of time base/WDT selection Three data accessing modes
Time base or WDT overflow output VLCD pin to adjust LCD operating voltage
Cascade application  

 General Description
---HT16220 is a peripheral device specially designed for I/O type uC used to expand the display
and for capability. The max. display segment of the device are 256 patterns (32x8). It also supports serial
interface, buzzer sound, watchdog timer or time base timer functions. The HT16220 is a memory mapping
multi-function LCD controller. The software configuration feature of the HT16220 make it suitable for
multiple LCD applications including LCD modules and display subsystems. Only three lines are required
the interface between the host controller and the HT16220. The HT162X series have many kinds of
products that match various applications.