Abstract
Signal-generator is a kind of signal source in common use, broadly applied at the electronics electric circuit, auto control system and teaching experiment etc. The dissertation is usage of the AT89s51。 The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of In-System Programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the indus-try-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory pro-grammer. By combining a versatile 8-bit CPU with In-System Programmable Flash on a monolithic chip, the Atmel AT89S51 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications. single-chip microcomputer constitute of wave-form generator, which can generate triangle wave, square wave, sine wave etc.variety wave-form, the period of wave can be controlled ,.The wave form is explicit，with good frequency adjustment and stability perfon．'nance．Only by varying its software，not hardware，it'S possibleto obtain more complicated wave form．The output of the machine connect DAC0832 to carry on a DA conversion，again pass operation amplifier to put an end exportation wave-form. This design has advantage of simple circuit, tightly packed structure, cheap price, superior function etc. Key words: signal generator, single-chip microcomputer , wave-form adjustment
