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The UN will try its best to __________ all people have access to vaccines.(guarantee; participate; provide)

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As the UN chief urged, the pandemic has __________ the world an opportunity “for change”, and it is time for a reset.(guarantee; participate; provide)

已知FOSC=6MHZ,试编写程序,利用T0工作在方式2,使P1.0和P1.1分别输出周期为1ms和400us的方波。

当FOSC=6MHZ和FOSC=12MHZ时,最大定时值各为多少?

已知FOSC=12MHZ,试编写程序在P1.0输出脉冲,每秒产生一个脉宽1ms正脉冲,每分产生一个脉冲10ms正脉冲。

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