【正文】 C語言對機器底層硬件操作較為方便，模塊化程度高，可讀性與可移植性好。本系統(tǒng)中，單片機使用 晶振，機器周期約為 1us；AD9854 使用 20MHz有源晶振，為了減小消耗功率，旁路倍頻器和逆 SINC 函數(shù)濾波器。對 AD9854 進行設(shè)置，要求 AD9854 工作在 RAMPED FSK 模式下，輸出 1/2 幅度、0 相位，頻率步進量為1KHz，時間步進量 10ms，35~100KHz 掃頻的正弦波。按照公式 23 和41 可得K1=72B020C49B hex，K2=147AE147AE1 hex，ΔF=346DC5D63 hex，N=30D3F hex，其編程步驟如下：（1） 初始化，設(shè)置AD9854工作模式和使能模塊； （2）將初始頻率控制字 K1，K2 寫入 FF2 中； （3）將頻率步進量寫入48 位 DFW 中；（4）將時間步進量寫入20 位 RRC 中； （5）更新脈沖刷新數(shù)據(jù)。 部分源程序如下： ………… P2=0x1F； //設(shè)置控制寄存器 1F P0 =0x16； //設(shè)置工作模式為 RAMPED FSK，復(fù)位 ACC1，使用 外部更新； =0 =1 ………… P2=0x0A； //設(shè)置頻率控制字寄存器 F2 P0=0x01； //設(shè)置輸出頻率為 100KHz =0； =1； ………… 第 38 頁 共 60 頁參考文獻[1] Toshiku Sashida，Takashi Kenjo. An Introduction to Ultrasonic Motors[M]. Oxford Clarendon Press，1993：4~7. [2] [D].：1~18. [3] [D].：1~19. [4] 齊震，朱邦太，[J].：41~42. [5] 趙淳生，、應(yīng)用和發(fā)展[J].振動、測試與診斷 1999，19(1)：2~7. [6] 陳在禮，褚祥誠，—國內(nèi)最新動態(tài)[J].應(yīng)用聲學(xué) 1999，18(2)：1~5. 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[26] 陶益凡，唐慧強，黃勛. 基于 AD9854 的信號發(fā)生器設(shè)計[J]. ，22 (22)：241243.AT89C2051 Microcontroller Instructions Features Compatible with MCS51 Products 2 Kbytes of Reprogrammable Flash MemoryEndurance: 1,000 Write/Erase Cycles V to 6 V Operating Range Fully Static Operation: 0 Hz to 24 MHz TwoLevel Program Memory Lock 128 x 8Bit Internal RAM 15 Programmable I/O Lines Two 16Bit Timer/Counters Six Interrupt Sources Programmable Serial UART Channel Direct LED Drive Outputs OnChip Analog Comparator Low Power Idle and Power Down Modes DescriptionThe AT89C2051 is a lowvoltage, highperformance CMOS 8bit microputer with 2 Kbytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high density nonvolatile memory technology and is patible with the industry standard MCS51 instruction set and pinout. By bining a versatile 8bit CPU with Flash on a monolithic chip, the Atmel AT89C2051 is a powerful microputer which provides a highly flexible and cost effective solution to many embedded control applications.The AT89C2051 provides the following standard features: 2 Kbytes of Flash, 128 bytes of RAM, 15 I/O lines, two 16bit timer/counters, a five vector twolevel interrupt architecture, a full duplex serial port, a precision analog parator, onchip oscillator and clock circuitry. In addition, the AT89C2051 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 hardware reset. Pin Configuration Pin DescriptionVCC Supply voltage.GND Ground.Port 1Port 1 is an 8bit bidirectional I/O port. Port pins to provide internal pullups. and require external pullups. and also serve as the positive input (AIN0) and the negative input (AIN1), respectively, of the onchip precision analog parator. The Port 1 output buffers can sink 20 mA and can drive LED displays directly. When 1s are written to Port 1 pins, they can be used as inputs. When pins to are used as inputs and are externally pulled low, they will source current (IIL) because of the internal pullups.Port 1 also receives code data during Flash programming and program verification.Port 3Port 3 pins to , are seven bidirectional I/O pins with internal pullups. is hardwired as an input to the output of the onchip parator and is not accessible as a general purpose I/O pin. The Port 3 output buffers can sink 20 mA. When 1s are written to Port 3 pins they are pulled high by the internal pullups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low will source current (IIL) because of the pullups. Port Pin Alternate FunctionsRXD (serial input port)TXD (serial output port)INT0 (external interrupt 0)INT1 (external interrupt 1)T0 (timer 0 external input)T1 (timer 1 external input)Port 3 also serves the functions of various special features of the AT89C2051 as listed below: Oscillator CharacteristicsXTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier which can be configured for use as an onchip oscillator, as shown in Figure 1. Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven as shown in Figure 2. There