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　　关于ATtiny15L单片机
　　The ATtiny15L is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny15L achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.(about Dragon man)
　　The AVR core combines a rich instruction set with 32 general purpose working registers.All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
　　The ATtiny15L provides 1K byte of Flash, 64 bytes EEPROM, six general purpose I/O lines, 32 general purpose working registers, two 8-bit Timer/Counters, one with highspeed PWM output, internal oscillators, internal and external interrupts, programmable Watchdog Timer, 4-channel 10-bit Analog-to-Digital Converter with one differential voltage input with optional 20x gain, and three software-selectable Power-saving modes.
　　The Idle mode stops the CPU while allowing the ADC, analog comparator,Timer/Counters and interrupt system to continue functioning. The ADC Noise Reduction mode facilitates high-accuracy ADC measurements by stopping the CPU while allowing the ADC to continue functioning. The Power-down mode saves the register contents but freezes the oscillators, disabling all other chip functions until the next interrupt or hardware reset. The wake-up or interrupt on pin change features enable the ATtiny15L to be highly responsive to external events, still featuring the lowest power consumption while in the Power-saving modes.
　　ATtiny15L　Features
　　High-performance, Low-power AVR?8-bit Microcontroller
　　Advanced RISC Architecture
　　90 Powerful Instructions ?Most Single Clock Cycle Execution
　　32 x 8 General Purpose Working Registers
　　Fully Static Operation
　　Nonvolatile Program and Data Memories
　　1K Byte In-System Programmable Flash Program Memory
　　Endurance: 1,000 Write/Erase Cycles
　　64 Bytes EEPROM
　　Endurance: 100,000 Write/Erase Cycles
　　Programming Lock for Flash Program Data Security
　　Peripheral Features
　　Interrupt and Wake-up on Pin Change
　　Two 8-bit Timer/Counters with Separate Prescalers
　　One 150 kHz, 8-bit High-speed PWM Output
　　4-channel 10-bit ADC
　　One Differential Voltage Input with Optional Gain of 20x
　　On-chip Analog Comparator
　　Programmable Watchdog Timer with On-chip Oscillator
　　Special Microcontroller Features
　　In-System Programmable via SPI Port
　　Enhanced Power-on Reset Circuit
　　Programmable Brown-out Detection Circuit
　　Internal, Calibrated 1.6 MHz Tunable Oscillator
　　Internal 25.6 MHz Clock Generator for Timer/Counter
　　External and Internal Interrupt Sources
　　Low-power Idle and Power-down Modes
　　Power Consumption at 1.6 MHz, 3V, 25
　　Active: 3.0 mA
　　Idle Mode: 1.0 mA
　　Power-down: < 1
　　I/O and Packages
　　8-lead PDIP and 8-lead SOIC: 6 Programmable I/O Lines
　　Operating Voltages
　　2.7V - 5.5V
　　Internal 1.6 MHz System Clock