RELIANCE 45C272內(nèi)存擴(kuò)展模塊
看門狗定時(shí)器計(jì)數(shù)被重新初始化回輸入值，看門狗標(biāo)志位被清除，每次訪問任一寄存器時(shí)，看門狗中斷輸出被清除。定期訪問看門狗定時(shí)器將防止出現(xiàn)看門狗警報(bào)。如果未發(fā)生訪問，警報(bào)將重復(fù)出現(xiàn)。看門狗報(bào)警寄存器始終讀取輸入值。實(shí)際的倒計(jì)時(shí)值是內(nèi)部的，用戶無法訪問。將零寫入寄存器C和D將禁用看門狗報(bào)警功能。命令寄存器寄存器B是命令寄存器。在這個(gè)寄存器中有掩碼位、控制位和標(biāo)志位。以下段落描述了每一位。Te-位7傳輸啟用-此位啟用和禁用內(nèi)部和外部寄存器之間的數(shù)據(jù)跟蹤。當(dāng)設(shè)置為邏輯零（0）時(shí)，跟蹤被禁用，凍結(jié)外部寄存器中的數(shù)據(jù)。
The Watchdog Timer count is reinitialized back to the entered value, the Watchdog flag bit is cleared, and the Watchdog interrupt output is cleared every time either of the registers is accessed. Periodic accesses to the Watchdog Timer will prevent the Watchdog Alarm from occurring. If access does not occur, the alarm will be repetitive. The Watchdog Alarm Register always reads the entered value. The actual countdown value is internal and not accessible to the user. Writing zeroes to Registers C and D will disable the Watchdog Alarm feature. Command Register Register B is the Command Register. Within this register are mask bits, control bits, and flag bits. The following paragraphs describe each bit. Te - Bit 7 Transfer Enable - This bit enables and disables the tracking of data between the internal and external registers. When set to a logic zero (0), tracking is disabled, freezing the data in the external register.
