GMS81C2120

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  30 high-voltage pins (40V,max)
  - 3 Input Only pins : 1 high-voltage pin
  - 1 Output Only pin
• Eight Interrupt Sources
  - 2 By External Sources (INT0, INT1)
  - 2 By Timer/Counter Sources (Timer0, Timer1)
  - 4 By Functional Sources (SPI,ADC,WDT,BIT)
• 12-Channel 8-Bit On-Chip Analog to Digital Converter
• Oscillatior :
  - Crystal
  - Ceramic Resonator
  - External RC Oscillator
  - Internal RCWDT Oscillatior
• Low Power Dissipation Modes
  - STOP mode
  - Wake-up Timer Mode
  - Standby Mode
  - Watch Mode
  - Subactive Mode
• Operating Voltage : 4.0V ~ 5.5V (at 4.5MHz)
• Operating Frequency : 0.4MHz ~ 4.5MHz
• Subclock : 32.768KHz Crystal Oscillator
• Enhanced EMS Improvement Power Fail Processor ( Noise Immunity Circuit )


Pinout




Specifications

Supply Voltage : V_DD . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3 to + 7.0V
Storage Temperature : T_STG . . . . . . . . . . . . . . . . . . . .  . . -40 to + 125 °C
Voltage on any pin with respect to Ground ( V_SS ) . . . . . . -0.3 to V_DD + 0.3V
I_OL per I/O Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Note: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these of any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.


Description

The GMS81C2020 and GMS81C2120 are an advanced CMOS 8-bit microcontroller with 20K/12K bytes of ROM. These are a powerful microcontroller which provides a highly flexible and cost effective solution to many VFD applications. GMS81C2120 provides the following standard features: 20K/12K 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, 8-bit, 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 GMS81C2020 and GMS81C2120 support power saving modes to reduce power consumption.