AT89S8253解密

    The AT89S8253 is a low-power, high-performance CMOS 8-bit microcontroller with 12K bytes of In-System Programmable (ISP) Flash program memory and 2K bytes of EEPROM data memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip downloadable Flash allows the program memory to be reprogrammed in-system through an SPI serial interface or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with downloadable Flash on a monolithic chip, the Atmel AT89S8253 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.
　　The AT89S8253 provides the following standard features: 12K bytes of In-System Programmable Flash, 2K bytes of EEPROM, 256 bytes of RAM, 32 I/O lines, programmable watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector, four-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S8253 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 oscillator, disabling all other chip functions until the next external interrupt or hardware reset.
　　The on-board Flash/EEPROM is accessible through the SPI serial interface. Holding RESET active forces the SPI bus 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.
　　AT89S8253 特性
　　Compatible with MCS?-51 Products
　　12K Bytes of In-System Programmable (ISP) Flash Program Memory
　　– SPI Serial Interface for Program Downloading
　　– Endurance: 10,000 Write/Erase Cycles
　　2K Bytes EEPROM Data Memory
　　– Endurance: 100,000 Write/Erase Cycles
　　64-byte User Signature Array
　　2.7V to 5.5V Operating Range
　　Fully Static Operation: 0 Hz to 24 MHz (in x1 and x2 Modes)
　　Three-level Program Memory Lock
　　256 x 8-bit Internal RAM
　　32 Programmable I/O Lines
　　Three 16-bit Timer/Counters
　　Nine Interrupt Sources
　　Enhanced UART Serial Port with Framing Error Detection and Automatic
　　Address Recognition
　　Enhanced SPI (Double Write/Read Buffered) Serial Interface
　　Low-power Idle and Power-down Modes
　　Interrupt Recovery from Power-down Mode
　　Programmable Watchdog Timer
　　Dual Data Pointer
　　Power-off Flag
　　Flexible ISP Programming (Byte and Page Modes)
　　– Page Mode: 64 Bytes/Page for Code Memory, 32 Bytes/Page for Data Memory
　　Four-level Enhanced Interrupt Controller
　　Programmable and Fuseable x2 Clock Option
　　Internal Power-on Reset
　　42-pin PDIP Package Option for Reduced EMC Emission
　　Green (Pb/Halide-free) Packaging Option
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