AT90S1200 - 8-Bit Microcontroller with 1K Bytes Downloadable Flash

Overview

The AT90S1200 is a low-power CMOS 8-bit microcontroller based on the AVR® enhanced RISC architecture. This microcontroller is designed for high performance and low power consumption, making it suitable for a wide range of embedded applications. By executing powerful instructions in a single clock cycle, the AT90S1200 achieves throughputs approaching 1 MIPS per MHz, allowing system designers to optimize power consumption versus processing speed.

The AVR core combines a rich instruction set with 32 general-purpose working registers, all directly connected to the Arithmetic Logic Unit (ALU). This architecture enables two independent registers to be accessed in a single instruction executed in one clock cycle, resulting in code efficiency and throughputs up to ten times faster than conventional CISC microcontrollers.

Features

• AVR® Enhanced RISC Architecture - High performance and low power RISC architecture with 89 powerful instructions, most executing in a single clock cycle.
• Memory:
  • 1K bytes of In-System Reprogrammable Downloadable Flash with SPI serial interface for program downloading (Endurance: 1,000 Write/Erase Cycles).
  • 64 bytes of EEPROM (Endurance: 100,000 Write/Erase Cycles).
• 32 x 8 General Purpose Working Registers - All registers are directly connected to the ALU for efficient data processing.
• 15 Programmable I/O Lines - Flexible I/O configuration for interfacing with external devices.
• Wide Operating Voltage - VCC range of 2.7V to 6.0V.
• Fully Static Operation - Supports frequencies from 0 to 16 MHz with an instruction cycle time of 62.5 ns at 16 MHz.
• Timers and Counters - One 8-bit Timer/Counter with a separate prescaler.
• Interrupts - External and internal interrupt sources for responsive event handling.
• Watchdog Timer - Programmable Watchdog Timer with an on-chip oscillator for system reliability.
• On-Chip Analog Comparator - Integrated comparator for analog signal processing.
• Power Saving Modes:
  • Idle Mode - Stops the CPU while allowing peripherals to continue functioning.
  • Power Down Mode - Saves register contents and disables all chip functions except interrupt wake-up.
• Programming Lock - Software security feature to protect code.
• 20-Pin Package - Compact form factor for space-constrained applications.
• On-Chip RC Oscillator - Optional internal oscillator for zero external components.

Applications

The AT90S1200 is versatile and can be used in a variety of applications, including but not limited to:

• Consumer Electronics
• Industrial Control Systems
• Automotive Accessories
• Home Automation
• Sensor Interfaces
• Battery-Powered Devices
• Embedded Systems
• Security Systems

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VCC): -0.5V to +7.0V
• Input Voltage (Any Pin): -0.5V to VCC + 0.5V
• Operating Temperature: -40°C to +85°C
• Storage Temperature: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (VCC): 2.7V to 6.0V
• Operating Frequency: 0 to 16 MHz
• Temperature Range: -40°C to +85°C

Power Consumption

• Active Mode (16 MHz, 5V): 10 mA (typical)
• Idle Mode (16 MHz, 5V): 3.5 mA (typical)
• Power Down Mode (5V): 1 µA (typical)

Package Information

The AT90S1200 is available in a 20-pin package with the following configurations:

• 20-Pin PDIP (Plastic Dual In-Line Package) - Standard through-hole mounting.
• 20-Pin SOIC (Small Outline Integrated Circuit) - Surface-mount package for compact designs.

Pin Configuration

The pinout of the AT90S1200 includes:

• VCC - Supply voltage.
• GND - Ground.
• Port B (PB0-PB7) - 8-bit bidirectional I/O port with internal pull-up resistors.
• Port D (PD0-PD6) - 7-bit bidirectional I/O port with internal pull-up resistors.
• RESET - Active-low reset input.
• XTAL1/XTAL2 - Crystal oscillator connections.
• Analog Comparator Inputs (AIN0, AIN1) - Inputs for the on-chip analog comparator.

Conclusion

The AT90S1200 is a powerful, low-power 8-bit microcontroller that combines high performance with energy efficiency. Its advanced RISC architecture, versatile memory options, and rich peripheral set make it an excellent choice for a wide range of embedded applications. With its compact package and flexible power-saving modes, the AT90S1200 is ideal for battery-operated and space-constrained designs.