...正弦波,三角波)且频率步进可调的信号发生器。答:void INT0_isr(void);void Init_PORT(void);void INT0_init(void);unsigned int select_num,num;unsigned int pl,zkb;const unsigned char sin_tab[]= { 128,130,132,135,137,139,141,143,146,148,150,152,154,157,159,161,163,165,167,169,171,174,176,178,180,182,184,186,188,...