Features: • Compatible with MCS®51 Products
• 2K/4K Bytes of In-System Programmable (ISP) Flash Program Memory
Serial Interface for Program Downloading
Endurance: 10,000 Write/Erase Cycles
• 2.7V to 5.5V Operating Range
• Fully Static Operation: 0 Hz to 24 MHz
• Two-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 15 Programmable I/O Lines
• Two 16-bit Timer/Counters
• Six Interrupt Sources
• Programmable Serial UART Channel
• Direct LED Drive Outputs
• On-chip Analog Comparator with Selectable Interrupt
• 8-bit PWM (Pulse-width Modulation)
• Low Power Idle and Power-down Modes
• Brownout Reset
• Enhanced UART Serial Port with Framing Error Detection and Automatic
Address Recognition
• Internal Power-on Reset
• Interrupt Recovery from Power-down Mode
• Programmable and Fuseable x2 Clock Option
• Four-level Enhanced Interrupt Controller
• Power-off Flag
• Flexible Programming (Byte and Page Modes)
Page Mode: 32 Bytes/Page
• User Serviceable Signature Page (32 Bytes)Pinout
SpecificationsOperating Temperature ...............................-55°C to +125°C
Storage Temperature ....................................65°C to +150°C
Voltage on Any Pin with Respect to Ground......-0.7V to +6.2V
Maximum Operating Voltage ............................................5.5V
DC Output Current..............25.0 mA (15.0 mA for AT89S4051)
*NOTICE: Stresses beyond 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 or any other conditions beyond 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.
DescriptionThe AT89S2051/S4051 is a low-voltage, high-performance CMOS 8-bit microcontroller with 2K/4K bytes of In-System Programmable (ISP) Flash program memory. The device is manufactured using Atmel's high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89S2051/S4051 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications. Moreover, the AT89S2051/S4051 is designed to be function compatible with the AT89C2051/C4051 devices, respectively.
The AT89S2051/S4051 provides the following standard features: 2K/4K bytes of Flash, 256 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a six-vector, fourlevel interrupt architecture, a full duplex enhanced serial port, a precision analog comparator, on-chip and clock circuitry. Hardware support for PWM with 8-bit resolution and 8-bit prescaler is available by reconfiguring the two on-chip timer/counters. In addition, the AT89S2051/S4051 is designed with static logic for operation down to zero frequency and supports two software-selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the disabling all other chip functions until the next external interrupt or hardware reset.
AT89S2051 Data Sheet
