CC-PDIL01Module 数字输入卡

产品标题:CC-PDIL01，Digital Input 24V Module 数字输入卡

型号： CC-PDIL01

品牌：霍尼韦尔

                                                             产品详情资料：

预分频器预分频器用于导出滴答计时器、VME访问计时器、重置计时器、总线仲裁计时器、本地总线计时器和VMEbus计时器所需的各种时钟。预分频器分频本地总线时钟以产生所需的恒定频率时钟。复位后，需要软件根据本地总线时钟加载适当的常数，以确保预分频器的正确操作。滴答计时器VMEchip2包括两个通用滴答计时器。这些计时器可用于以不同的速率产生中断，或者可以在不同的时间读取计数器以进行间隔计时。计时器的分辨率为1?s，自由运行时，计时器每71.6分钟滚动一次。每个滴答计时器都有一个32位计数器、一个32比特比较寄存器、一个4比特溢出寄存器、一位启用位、一位溢出清除位和一位清除oncompare启用位。计数器随时可读写，在自由运行模式下启用时，计数器每1?s递增一次。在清除比较模式下启用计数器时，计数器每1?s递增一次，直到计数器值与比较寄存器中的值匹配。当匹配发生时，计数器将被清除。当匹配发生时，在任一模式下，都会向本地总线中断器发送一个中断，并且溢出计数器会递增。只有当本地总线中断器启用滴答定时器中断时，才会产生对本地总线的中断。通过向溢出清除位写入1，可以清除溢出计数器。

                         产品英文详情料:

Prescaler The prescaler is used to derive the various clocks required by the tick timers, VME access timers, reset timer, bus arbitration timer, local bus timer, and VMEbus timer. The prescaler divides the local bus clock to produce the constant-frequency clocks required. Software is required to load the appropriate constant, depending upon the local bus clock, following reset to ensure proper operation of the prescaler. Tick Timer The VMEchip2 includes two general purpose tick timers. These timers can be used to generate interrupts at various rates or the counters can be read at various times for interval timing. The timers have a resolution of 1 ?s and when free running, they roll over every 71.6 minutes. Each tick timer has a 32-bit counter, a 32-bit compare register, a 4-bit overflow register, an enable bit, an overflow clear bit, and a clear-oncompare enable bit. The counter is readable and writable at any time and when enabled in the free run mode, it increments every 1 ?s. When the counter is enabled in the clear-on-compare mode, it increments every 1?s until the counter value matches the value in the compare register. When a match occurs, the counter is cleared. When a match occurs, in either mode, an interrupt is sent to the local bus interrupter and the overflow counter is incremented. An interrupt to the local bus is only generated if the tick timer interrupt is enabled by the local bus interrupter. The overflow counter can be cleared by writing a one to the overflow clear bit.

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