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DS1994L-F5 Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS1994L-F5 Datasheet(HTML) 7 Page - Dallas Semiconductor |
7 / 22 page DS1994 7 of 22 3 RTE Real-time clock alarm flag 4 ITE Interval timer alarm flag 5 CCE Cycle counter alarm flag Writing any of the interrupt enable bits to a logic 0 allows an interrupt condition to be generated when its corresponding alarm flag is set (see the Interrupts section). Control Register 7 6543 2 1 0 DSEL STOP START AUTO MAN. OSC RO WPC WPI WPR 0201h 0 WPR Write protect real-time clock/alarms registers 1 WPI Write protect interval timer/alarms registers 2 WPC Write protect cycle counter/alarms registers Setting a write protect bit to a logic 1 permanently write protects the corresponding counter and alarm registers, all write protect bits, and additional bits in the control register. The write protect bits cannot be written in a normal manner (see the Write Protect/Programmable Expiration section). 3 RO Read only If a programmable expiration occurs and the read only bit is set to a logic 1, then the DS1994 becomes read only. If a programmable expiration occurs and the read only bit is a logic 0, then only the 64-bit lasered ROM can be accessed (see the Write Protect/Programmable Expiration section). 4 OSC Oscillator enable This bit controls the crystal oscillator. When set to a logic 1, the oscillator starts operation. When the oscillator bit is a logic 0, the oscillator stops. 5 AUTO/MAN Automatic/Manual Mode When this bit is set to a logic 1, the interval timer is in automatic mode. In this mode, the interval timer is enabled by the data line. When this bit is set to a logic 0, the interval timer is in manual mode. In this mode, the interval timer is enabled by the STOP/START bit. 6 STOP/START Stop/Start (in manual mode) If the interval timer is in manual mode, the interval timer starts counting when this bit is set to a logic 0 and stops counting when set to a logic 1. If the interval timer is in automatic mode, this bit has no effect. |
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