External devices — For instance, Universal Serial Bus (USB) ports or the system clock.
外部设备——例如，通用串行总线(usb)端口或系统时钟。
ICS1523 is a high performance programmable line-lock clock generator with the I2C serial bus interface. User can use it to generate desired line-locked clock by programming it.
ICS1523是一种高性能可编程行同步信号发生器，它带有一个I2C串行总线接口，可以方便地对内部寄存器进行配置，能产生用户需要的同步信号。
Once you verify the bus speed, you can confidently write the timer, serial-I/O, and other clock-dependent routines.
一旦检验总线速度，可以信赖的写定时器、串行I/O和其他时钟有关的程序。
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