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FM3808 Scheda tecnica(PDF) 3 Page - Ramtron International Corporation |
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FM3808 Scheda tecnica(HTML) 3 Page - Ramtron International Corporation |
3 / 27 page N O T R EC O M M EN D ED FO R N EW D ES IG N S La st Ti m e B uy : S ept . 200 6 N o Di re ct Re pl ac em en t Al te rn at e So lu tio n: FM 18 08 +F M 40 05 FM3808 Rev. 1.3 (EOL) Feb. 2006 Page 3 of 27 Functional Truth Table /CE /WE /OE Function H X X Standby/Precharge ! X X Latch Address L H L Read L L X Write Overview The FM3808 integrates three complementary but distinct functions under a common interface in a single package. First, is the 32Kx8 FRAM memory block (minus 16 bytes), second is the real-time clock/calendar, and third is the system supervisor. The functions are integrated to enhance their individual performance, so that each provides better capability than three similar stand-alone devices. All functions use the same bytewide address/data interface and are memory mapped. Special functions, including the clock/calendar and supervisor system, are controlled via registers that reside in the top of the combined memory map. The register map is described below, followed by a detailed description of each functional block. Register Map The top 16 FRAM address locations control the clock/calendar, alarm, and supervisor functions. The registers contain timekeeping data, control bits, or information flags. A short description of each register follows. Detailed descriptions of each function follow the register summary. Register Map Summary Table Data Address D7 D6D5 D4D3D2D1D0 Function Range 7FFFh 10 years years Years 00-99 7FFEh 0 0 0 10 mo months Month 1-12 7FFDh 0 0 10 date date Date 1-31 7FFCh 0 0 0 0 0 day Day 1-7 7FFBh 0 0 10 hours hours Hours 0-23 7FFAh 0 10 minutes minutes Minutes 0-59 7FF9h 0 10 seconds seconds Seconds 0-59 7FF8h /OSCEN reserved reserved CALS CAL3 CAL2 CAL1 CAL0 Control-NV 7FF7h WDS /WDW WDT5 WDT4 WDT3 WDT2 WDT1 WDT0 Watchdog 7FF6h WIE AIE PFE ABE H/L P/L reserved reserved Interrupts 7FF5h /Match 0 Alarm 10 date Alarm date Alarm Date 1-31 7FF4h /Match 0 Alarm 10 hours hours Alarm Hours 0-23 7FF3h /Match Alarm 10 minutes Alarm minutes Alarm Minutes 0-59 7FF2h /Match Alarm 10 seconds Alarm seconds Alarm Seconds 0-59 7FF1h User-NV 7FF0h WDF AF PF CF TST CAL W R Flags/Control Note that the shaded register bits are implemented in FRAM, therefore data at these locations is retained even without backup power. |
Codice articolo simile - FM3808_06 |
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Descrizione simile - FM3808_06 |
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