產(chǎn)品標(biāo)題:8C-TDODA1 數(shù)字量輸出模塊安裝底板，非冗余，帶涂層

型號： 8C-TDODA1

品牌：霍尼韋爾

                                                                產(chǎn)品詳情資料：

預(yù)分頻器預(yù)分頻器用于導(dǎo)出滴答計(jì)時(shí)器、VME訪問計(jì)時(shí)器、重置計(jì)時(shí)器、總線仲裁計(jì)時(shí)器、本地總線計(jì)時(shí)器和VMEbus計(jì)時(shí)器所需的各種時(shí)鐘。預(yù)分頻器分頻本地總線時(shí)鐘以產(chǎn)生所需的恒定頻率時(shí)鐘。復(fù)位后，需要軟件根據(jù)本地總線時(shí)鐘加載適當(dāng)?shù)某?shù)，以確保預(yù)分頻器的正確操作。滴答計(jì)時(shí)器VMEchip2包括兩個(gè)通用滴答計(jì)時(shí)器。這些計(jì)時(shí)器可用于以不同的速率產(chǎn)生中斷，或者可以在不同的時(shí)間讀取計(jì)數(shù)器以進(jìn)行間隔計(jì)時(shí)。計(jì)時(shí)器的分辨率為1?s，自由運(yùn)行時(shí)，計(jì)時(shí)器每71.6分鐘滾動一次。每個(gè)滴答計(jì)時(shí)器都有一個(gè)32位計(jì)數(shù)器、一個(gè)32比特比較寄存器、一個(gè)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(jì)數(shù)器隨時(shí)可讀寫，在自由運(yùn)行模式下啟用時(shí)，計(jì)數(shù)器每1?s遞增一次。在清除比較模式下啟用計(jì)數(shù)器時(shí)，計(jì)數(shù)器每1?s遞增一次，直到計(jì)數(shù)器值與比較寄存器中的值匹配。當(dāng)匹配發(fā)生時(shí)，計(jì)數(shù)器將被清除。當(dāng)匹配發(fā)生時(shí)，在任一模式下，都會向本地總線中斷器發(fā)送一個(gè)中斷，并且溢出計(jì)數(shù)器會遞增。只有當(dāng)本地總線中斷器啟用滴答定時(shí)器中斷時(shí)，才會產(chǎn)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(jì)數(shù)器。

                         產(chǎn)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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