These persistent registers are powered by a battery and receive a timing clock signal from a crystal oscillator.
这些持续不断的寄存器由电池供电，并接收来自晶体振荡器计时的时钟信号。
2
Programmable hardware timing was used in design of microsecond synchronizer based on ISA bus, after pulse generated by oscillator was divided frequency, it was sent to 8254 to count.
基于IS A总线的微秒级同步器采用可编程硬件定时，由晶振发出脉冲经分频后送入8254计数。
3
The accurate timing-type solar photovoltaic controller comprises a microprocessor, a switching circuit, a crystal oscillator and a timer.