General Description
HT1647A is a peripheral device specially designed for I/O type MCU used to expand the display capability. The max. display segment of the device are 1024 patterns (64 segments and 16 commons). It also supports four data bits interface, buzzer sound, Watchdog Timer or time base timer functions.
   
Features
• Operating voltage: 2.7V~5.2V
• Built-in 32kHz RC oscillator
• External 32.768kHz crystal oscillator or 32kHz
    frequency source input
• Standby current: <1μA at 3V, <2μA at 5V
• Internal resistor type: 1/5 bias or 1/4 bias, 1/16 duty
• Two selectable LCD frame frequencies: 89Hz or
    170Hz
• Max. 64x16 patterns, 64 segments and 16 commons
• Built-in bit-map display RAM: 1024 bits
    (=64x16 bits)
• Built-in internal resistor type bias generator
• Six-wire interface (four data wires)
• Eight kinds of time base/WDT selection
• Time base or WDT overflow output
• R/W address auto increment
• Built-in buzzer driver (2kHz/4kHz)
• Power down command reduces power consumption
• Software configuration feature
• Data mode and Command mode instructions
• Three data accessing modes
• Provides VLCD pin to adjust LCD operating voltage
• Provides three kinds of bias current programming
• Control of TN-type, STN-type LCDs and
    ECB-type LCDs
• 100-pin LQFP package and in chip form
   
Applications
• Leisure products
• Games
• Personal digital assistant
• Cellular phone
• Global positioning system
• Consumer electronics