Description The GMS81C2012 and GMS81C2020 are advanced CMOS 8-bit microcontroller with 12K/20K bytes of ROM. These are a powerful microcontroller which provides a highly flexible and cost effective solution to many VFD applications. These provide the following standard features: 12K/20K bytes of ROM, 448 bytes of RAM, 8-bit timer/counter, 8-bit A/D converter, 10-bit High Speed PWM Output, Programmable Buzzer Driving Port, 8-bit Basic Interval Timer, 7-bit Watch dog Timer, Serial Peripheral Interface, on-chip oscillator and clock circuitry. They also come with high voltage I/O pins that can directly drive a VFD (Vacuum Fluorescent Display). In addition, the GMS81C2012 and GMS81C2020 support power saving modes to reduce power consumption. Features • 20K/12K bytes ROM(EPROM) • 448 Bytes of On-Chip Data RAM (Including STACK Area) • Minimum Instruction Execution time: - 1uS at 4MHz (2cycle NOP Instruction) • One 8-bit Basic Interval Timer • One 7-bit Watch Dog Timer • Two 8-bit Timer/Counters • 10-bit High Speed PWM Output • One 8-bit Serial Peripheral Interface • Two External Interrupt Ports • One Programmable 6-bit Buzzer Driving Port • 60 I/O Lines - 56 Programmable I/O pins (Included 30 high-voltage pins Max. 40V) - Three Input Only pins: 1 high-voltage pin - One Output Only pin • Eight Interrupt Sources - Two External Sources (INT0, INT1) - Two Timer/Counter Sources (Timer0, Timer1) - Four Functional Sources (SPI,ADC,WDT,BIT) • 12-Channel 8-bit On-Chip Analog to Digital Converter • Oscillator: - Crystal - Ceramic Resonator - External R Oscillator • Low Power Dissipation Modes - STOP mode - Wake-up Timer Mode - Standby Mode - Watch Mode - Sub-active Mode • Operating Voltage: 2.7V ~ 5.5V (at 4.5MHz) • Operating Frequency: 1MHz ~ 4.5MHz • Sub-clock: 32.768KHz Crystal Oscillator • Enhanced EMS Improvement Power Fail Processor (Noise Immunity Circuit)
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