Description
The GMS81C50 Series is an advanced CMOS 8-bit microcontroller with 16K/24K/32K bytes of ROM. The device is one of GMS800 family. The LG Semicon GMS81C50 Series is a powerful microcontroller which provides a highly flexible and cost effective solution to many UR & Keyboard applications. The GMS81C50 Series provides the following standard features: 16K/24K/32K bytes of ROM, 448 bytes of RAM, 8-bit timer/counter, on-chip oscillator and clock circuitry. In addition, the GMS81C50 Series supports power saving modes to reduce power consumption.

Features
• Instruction Cycle Time:
    - 1us at 4MHz
• Programmable I/O pins
• Operating Voltage
    - 2.2 ~ 4.0 V @ 4MHz
• Timer
    - Timer / Counter ......... 16 Bit * 1 ch
                                 ......... 8 Bit * 2 ch
    - Basic Interval Timer ...... 8 Bit * 1 ch
- Watch Dog Timer ............ 6Bit * 1ch
• 8 Interrupt sources
    * Nested Interrupt control is available.
    - External input: 2
    - Keyscan input
    - Basic Interval Timer
    - Watchdog timer
    - Timer : 3
• Power On Reset
• Power saving Operation Modes
    - STOP
    - SLEEP
• Low Voltage Detection Circuit
• Watch Dog Timer Auto Start (During 1second after Power on Reset)