IAR环境下的MSP430F149，使用定时器A，每隔5000个时钟周期点亮/熄灭LED的程序-　Descr iption: Toggle P3.4 using software and TA_0 ISR. Toggles every

　50000 SMCLK cycles. SMCLK provides clock source for TACLK.

//　During the TA_0 ISR, P3.4 is toggled and 50000 clock cycles are added to

　CCR0. TA_0 ISR is triggered every 50000 cycles. CPU is normally off and

　used only during TA_ISR.

　ACLK = n/a, MCLK = SMCLK = TACLK = default DCO ~800kHz

//　　　　　 MSP430F149

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//　　 /|\|　　　　　　XIN|-

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//　　 --|RST　　　　XOUT|-

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//　　　　|　　　　　 P3.4|-->LED