便携式电子计时器装有已过时间指示器，间隔计时器和电子开关计时器。
Portable electric timer functions as elapsed-time indicator, interval timer and electrical apparatus on-off timer.
其内部主要由DMA控制器(82c37)、中断控制器(82c59)、可编程间隔计时器(82c54)，DRAM刷新控制器，等待状态产生器，系统重置电路组成。
It is mainly composed of DMA controller (82c37), interrupt controller (82c59), programmable interval timers (82c54), DRAM refresh control, wait state generator and system reset logic.
除 EJB 3.0 基于间隔的计时器 API 外，这个领域最重大的改进是对 cron 风格调度的支持。
Most significant in this area is support for cron-style scheduling in addition to the EJB 3.0 interval based timer API.
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