RELIANCE 45C380自動(dòng)化輸入模塊
DS1384看門(mén)狗定時(shí)器中的時(shí)間功能可由用戶(hù)自行使用?？撮T(mén)狗定時(shí)器提供一個(gè)看門(mén)狗報警窗口，間隔時(shí)間在0.01到99.99秒之間。非易失性RAM在本手冊的NVRAM部分進(jìn)行了說(shuō)明?？撮T(mén)狗報警可在軟件控制下生成VME SYSFAIL。系統命令寄存器的第8位（見(jiàn)表3-1）用于啟用此選項。系統命令寄存器為2字節寬，位于內存地址$D800E。注意：要使用此選項，必須將看門(mén)狗定時(shí)器中斷輸出設置為電平模式（請參閱看門(mén)狗命令寄存器位4）。此外，看門(mén)狗報警通過(guò)一個(gè)雙狀態(tài)標頭（E8）連接到CPU復位或系統NMI，或兩者都不連接。如果跳線(xiàn)設置在2-4位置，用戶(hù)可以指示看門(mén)狗警報重置CPU；如果跳線(xiàn)處于4-6位置，則啟動(dòng)非屏蔽中斷（NMI）；或者如果跳線(xiàn)被完全移除，則兩者都沒(méi)有。
The Time of Day feature in the DS1384 Watchdog Timer is available for use by the user at their discretion. The Watchdog Timer provides a Watchdog Alarm window and interval timing between 0.01 and 99.99 seconds. The Non-Volatile RAM is explained in the NVRAM section of this manual. The Watchdog Alarm can, under software control, generate a VME SYSFAIL. Bit 8 of the System Command register (see Table 3-1) is used to enable this option. The System Command Register is 2 bytes wide located at memory address $D800E. NOTE: The Watchdog Timer Interrupt output must be set to Level Mode (see Watchdog Command Register Bit 4) to use this option. In addition, the Watchdog Alarm is connected via a two state header (E8) to either or neither the CPU reset or the system NMI. The user can direct the Watchdog Alarm to reset the CPU if the jumper is set in the 2-4 position; to initiate a Non-Maskable Interrupt (NMI) if the jumper is in the 4-6 position; or neither if the jumper is completely removed.
