General Description
The HTG1390 is the processor from Holtek’s 4-bit stand alone single chip microcontroller range specifically designed for LCD product applications. The device is ideally suited for multiple LCD low power applications among which are calculators, scales, and hand held LCD products.

Features
• Operating voltage: 1.2V~1.8V
• 7 input lines
• 3 output lines
• Halt feature reduces power consumption
• Up to 16µs instruction cycle with 256kHz system clock at VDD=1.5V
• All instructions in 1 or 2 machine cycles
• 4K×8 program ROM
• Data memory RAM size 128×4 bits
• 27×3 segment LCD driver
• 8-bit table read instruction
• 5 working registers
• Internal timer overflow interrupt
• One level subroutine nesting
• RC oscillator for system clock
• 8-bit timer with internal clock source
• Sound effect circuit