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FM3130 データシート(PDF) 11 Page - Ramtron International Corporation |
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FM3130 データシート(HTML) 11 Page - Ramtron International Corporation |
11 / 22 page O BS O LE TE N o D ire ct R ep la ce m en t Al te rn at iv e: FM 31 64 FM3130 Integrated RTC/Alarm with 64Kb FRAM Rev. 3.2 Sept. 2011 Page 11 of 22 CALS Calibration Sign: Determines if the calibration adjustment is applied as an addition to or as a subtraction from the time-base. This bit can be written only when CAL=1. Battery-backed, read/write. CAL.4-0 Calibration Code: These five bits control the calibration of the clock. These bits can be written only when CAL=1. Battery-backed, read/write. 00h RTC/Alarm Control D7 D6 D5 D4 D3 D2 D1 D0 LB AF CF POR AEN CAL W R LB Low Battery Flag: If the VBAK source drops to a voltage level insufficient to operate the RTC/alarm, this bit will be set to „1‟. All registers need to be re-initialized since the battery-backed register values should be treated as unknown. The user should clear it to „0‟ when initializing the system. Battery-backed. Read/Write (internally set, user can clear bit by writing to a „0‟). AF Alarm Flag: This read-only bit is set to 1 when the time/date match the values stored in the alarm registers with the Match bit(s) = 0. It is cleared when the RTC/Alarm Control register is read. Battery-backed. CF Century Overflow Flag: This read-only bit is set to a 1 when the values in the years register overflows from 99 to 00. This indicates a new century, such as going from 1999 to 2000 or 2099 to 2100. The user should record the new century information as needed. This bit is cleared when the RTC/Alarm Control register is read. Battery-backed. POR Power On Reset Flag: When VDD drops below VSW, the POR bit will be set to „1‟. Battery-backed. Read/Write (internally set, user can clear bit by writing to a „0‟). AEN Alarm Enable: This bit enables the alarm function. When AEN is set (and CAL cleared), the ACS pin operates as an active-low alarm and the AF flag function is enabled. The function of the ACS pin is detailed in Table 3. When AEN is cleared, no new alarm events will occur but the AF flag and ACS pin will not be cleared. Battery-backed, read/write. CAL Calibration Mode: When CAL is set to „1‟, the clock enters calibration mode. When CAL is set to „0‟, the clock operates normally, and the ACS pin is controlled by the RTC alarm. Battery-backed, read/write. W Write RTC: Setting the W bit to „1‟ freezes updates of the user timekeeping registers. The user can then write them with updated values. Setting the W bit to „0‟ causes the contents of the time registers to be transferred to the timekeeping counters. Battery-backed, read/write. R Read RTC: Setting the R bit to „1‟ copies a static image of the timekeeping core and place it into the user registers. The user can then read them without concerns over changing values causing system errors. The R bit going from „0‟ to „1‟ causes the timekeeping capture, so the bit must be returned to „0‟ prior to reading again. Battery-backed, read/write. |
同様の部品番号 - FM3130 |
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同様の説明 - FM3130 |
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