ARM的延时研究，给出了各种样式多方法，并对其中一种进行测试。-The ARM delay_study, the delay of research method, and the style of a test.

__delay_cycles函数测试，在iar for msp430平台编译，测试芯片msp430g2553-the __delay_cycles function test in IAR for MSP430 platform to compile, test chip MSP430G2553