AT89S2051解密

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The 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.
　　The on-board Flash program memory is accessible through the ISP serial interface. Holding RST active forces the device into a serial programming interface and allows the program memory to be written to or read from, unless one or more lock bits have been activated.
　　AT89S2051 特性
　　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 (x1 and x2 Modes)
　　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)