Description
The GMS81C4040/GMS87C4060 is an advanced CMOS 8-bit microcontroller with 40K(60K) bytes of ROM. The device is one of GMS800 family. The HYUNDAI’s GMS81C4040/GMS87C4060 is a powerful microcontroller which provides a highly flexible and cost effective solution to many TV applications. The GMS81C4040/GMS87C4060 provides the following standard features: 40K(60K) bytes of ROM, 1,536 bytes of RAM, 8-bit timer/counter .

Features
• 40K(60K) Bytes On-chip Program Memory
• 1,536 Bytes of On-chip Data RAM (Included 256 bytes stack memory)
• Instruction Cycle Time (ex:NOP)
   - 0.5us at 8MHz
• 40 Programmable I/O pins
   - 33 I/O and 7 Output pins
• Serial I/O : 8bit x 1ch
• I2C Bus interface
   - Multimaster (2 Pairs interface pins)
• A/D Converter : 8bit x 6ch (TBD LSB)
• Pulse Width Modulation
   - 14bit x 1ch
   - 8bit x 6ch
• Timer
   - Timer/Counter : 8bit x 4ch (16bit x 2ch)
   - Basic interval timer : 8bit x 1ch
   - Watch Dog Timer
• Number of Interrupt sources : 18
• On Screen Display
   - Number of characters : 512 (6 characters are reserved for IC test)
   - Character size : 12 dots(X) x 16 dots(Y)
   - Character display size : Large, Medium, Small
   - DIsplay capability : 24Characters x 16 Line (Two line VRAM buffer)
   - Character, Back ground color : 16kinds
   - Special functions : Rounding, Outline, Sprite, Shadow,...
• Buzzer Driving port
   - 500Hz ~ 250kHz @8MHz (Duty 50%)
• Operating Range : 4.5V to 5.5V