Description
The GMS87C1404 and GMS87C1408 are an advanced CMOS 8-bit microcontroller with 4K/8K bytes of EPROM. The HYUNDAI MicroElectronics GMS87C1404 and GMS87C1408 are a powerful microcontroller which provides a highly flexible and cost effective solution to many small applications such as controller for battery charger. The GMS87C1404 and GMS87C1408 provide the following standard features: 4K/8K bytes of EPROM, 192 bytes of RAM, 8-bit timer/counter, 8-bit A/D converter, 10-bit high speed PWM output, programmable buzzer driving port, 8-bit serial communication port, on-chip oscillator and clock circuitry. In addition, the GMS87C1404 and GMS87C1408 supports power saving modes to reduce power consumption.

FEATUREs
• 4K/8K Bytes On-chip Program Memory (OTP)
• 192 Bytes of On-chip Data RAM (Included stack memory)
• Instruction Cycle Time:
   - 250nS at 8MHz
• 23 Programmable I/O pins (LED direct driving can be source and sink)
• 2.5V to 5.5V Wide Operating Range
• One 8-bit A/D Converter
• One 8-bit Basic Interval Timer
• Four 8-bit Timer / Counters
• Two 10-bit High Speed PWM Outputs
• Watchdog timer (can be operate with internal RC-oscillation)
• One 8-bit Serial Peripheral Interface
• Twelve Interrupt sources
   - External input: 4
   - A/D Conversion: 1
   - Serial Peripheral Interface: 1
   - Timer: 6
• One Programmable Buzzer Driving port
   - 500Hz ~ 130kHz
• Oscillator Type
   - Crystal
   - Ceramic Resonator
• Noise Immunity Circuit
   - Power Fail Processor
• Power Down Mode
   - STOP mode
   - Wake-up Timer mode