DAC 100需要能够递加和递减计数，因此复位条件应当将其带到接近其中间范围的点。
The DAC 100 needs to be able to count up and down and consequently a reset condition should take it to a point near its mid-range.
时钟或者选通信号用于比较器、递增-递减计数器102和数模转换器100的同步操作，以便避免这些部件竞争。
A clock or a strobe signal is used to synchronise operation of the comparator, the up-down counter 102 and the digital to analog converter 100 so as to avoid these components racing.
它可用于保存可以在执行Branch指令期间递减的循环计数。
It can be used to hold a loop count that can be decremented during execution of Branch instructions.
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