CC-PDIL01Module 數字輸入卡_廈門阿米控技術有限公司

產品標題:CC-PDIL01，Digital Input 24V Module 數字輸入卡

型號： CC-PDIL01

品牌：霍尼韋爾

產品詳情資料：

預分頻器預分頻器用於導出滴答計時器、VME訪問計時器、重置計時器、總線仲裁計時器、本地總線計時器和VMEbus計時器所需的各種時鐘。預分頻器分頻本地總線時鐘以產生所需的恒定頻率時鐘。復位後，需要軟件根據本地總線時鐘加載適當的常數，以確保預分頻器的正確操作。滴答計時器VMEchip2包括兩個通用滴答計時器。這些計時器可用於以不同的速率產生中斷，或者可以在不同的時間讀取計數器以進行間隔計時。計時器的分辨率為1?s，自由運行時，計時器每71.6分鐘滾動一次。每個滴答計時器都有一個32位計數器、一個32比特比較寄存器、一個4比特溢出寄存器、一位啟用位、一位溢出清除位和一位清除oncompare啟用位。計數器隨時可讀寫，在自由運行模式下啟用時，計數器每1?s遞增一次。在清除比較模式下啟用計數器時，計數器每1?s遞增一次，直到計數器值與比較寄存器中的值匹配。當匹配發生時，計數器將被清除。當匹配發生時，在任一模式下，都會向本地總線中斷器發送一個中斷，並且溢出計數器會遞增。只有當本地總線中斷器啟用滴答定時器中斷時，才會產生對本地總線的中斷。通過向溢出清除位寫入1，可以清除溢出計數器。

產品英文詳情料:

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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