msp430官方JTAG仿真器电路指南，包括4线仿真和spi-bi-wire 两线仿真，其中spi-bi-wire只能用usb下载线，还有一个并口下载线电路图-from the official circuit of the msp430 JTAG simulation ,include the four wire and two wire(spi_bi_wire),the spi_bi_wire only be used when using the usb download