Description
The GMS81C5108 is an advanced CMOS 8-bit microcontroller with 8K bytes of ROM. The device is one of GMS800 family. The Hynix GMS81C5108 is a powerful microcontroller which provides a high flexibility and cost effective solution to many LCD applications. The GMS81C5108 provides the following standard features: 8K bytes of ROM, 192 bytes of RAM, 37 Nibbles of Display RAM, 8/16-bit timer/counter, on-chip oscillator and clock circuitry. In addition, the GMS81C5108 supports power saving modes to reduce power consumption.

 Features
• 8K Bytes of On-chip Program Memory
• 192 Bytes of On-chip Data RAM
• 37 Nibbles of Display RAM
• Instruction Cycle Time:
    - 1us at 4MHz (2 cycle NOP instruction)
• 24 Programmable I/O pins
• 2V to 4V Operating Range
• Dual Clock Operation
    - main : 400kHz ~ 4.2MHz
    - sub. : 32.768kHz
• One 8-bit Basic Interval Timer/Counter
• Key Scan Interrupt
• Two 8-bit Timer/ Counter
    (It can be used one 16-bit Timer/Counter)
• Watch Timer (2Hz, 4Hz, 16Hz, 1/64Hz)
• 8-bit Serial I/O (SIO)
• One 10-bit High Speed PWM Output
• Carrier Generator for Remote Controller
• 11 Interrupt sources
    - 3 External interrupts (INT0 ~ 2)
    - 8 Internal interrupts (BIT, Timer × 2, WT, A/DC, SIO, REM, Keyscan)
• 6-bit Buzzer Driving port
    - 500Hz ~ 250kHz (@4MHz)
• 4-channel 8-bit On-chip A/D Converter
• Power Saving Mode
    - STOP, SLEEP, Sub Active mode
• LCD display/controller (LCDC)
    - Static Mode (37Seg × 1Com, 1/3 Bias)
    - 1/2 Duty Mode (36Seg × 2Com, 1/3 Bias)
    - 1/3 Duty Mode (35Seg × 3Com, 1/3 Bias)
    - 1/4 Duty Mode (34Seg × 4Com, 1/3 Bias)
• LCD Display Voltage Booster
• Supply Voltage Detector(SVD)
    - 2 level detector (2.2V, 1.7V)