AT89S4051解密

    The AT89S4051 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.
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　　AT89S4051 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)