试编程应用DAC0832输出锯齿波如图所示，锯齿波的频率为1000HZ（即周期为1ms），系统晶振为12MHZ。(假设DAC0832的芯片地址为A000H)(As shown in the DAC0832 output sawtooth wave, the frequency of the sawtooth wave is 1000HZ (that is, the period is 1ms), and the system crystal oscillator is 12MHZ. (assum