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)