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BQ4845YS- Datasheet(PDF) 4 Page - Texas Instruments |
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BQ4845YS- Datasheet(HTML) 4 Page - Texas Instruments |
4 / 22 page Address Map The bq4845 provides 16 bytes of clock and control status registers. Table 1 is a map of the bq4845 registers, and Table 2 describes the register bits. Clock Memory Interface The bq4845 has the same interface for clock/calendar and control information as standard SRAM. To read and write to these locations, the user must put the bq4845 in the proper mode and meet the timing requirements. Read Mode The bq4845 is in read mode whenever OE (Output en- able) is low and CS (chip select) is low. The unique ad- dress, specified by the 4 address inputs, defines which one of the 16 clock/calendar bytes is to be accessed. The bq4845 makes valid data available at the data I/O pins within tAA (address access time). This occurs after the last address input signal is stable, and providing the CS and OE (output enable) access times are met. If the CS and OE access times are not met, valid data is available after the latter of chip select access time (tACS) or output enable access time (tOE). CS and OE control the state of the eight three-state data I/O signals. If the outputs are activated before tAA, 4 Ad- dress (h) D7 D6 D5 D4 D3 D2 D1 D0 12-Hour Range (h) Register 0 0 10-second digit 1-second digit 00–59 Seconds 1 ALM1 ALM0 1-second digit 00–59 Seconds alarm 10-second digit 2 0 10-minute digit 1-minute digit 00–59 Minutes 3 ALM1 ALM0 1-minute digit 00–59 Minutes alarm 10-minute digit 4 PM/AM 0 10-hour digit 1-hour digit 01–12 AM/ 81– 92 PM Hours 5 ALM1 ALM0 10-hour digit 1-hour digit 01–12 AM/ 81–92 PM Hours alarm PM/AM 6 0 0 10-day digit 1-day digit 01–31 Day 7 ALM1 ALM0 10-day digit 1-day digit 01–31 Day alarm 8 0 0 0 Day-of-week digit 01–07 Day-of-week 9 0 0 0 10 mo. 1-month digit 01–12 Month A 10-year digit 1-year digit 00–99 Year B * WD2 WD1 WD0 RS3 RS2 RS1 RS0 Programmable rates C * * AIE PIE PWRIE ABE Interrupt en- ables D * * AF PF PWRF BVF Flags E * * UTI STOP 24/12 DSE Control F * * * * * * * * Unused Notes: * = Unused bits; unwritable and read as 0. 0 = should be set to 0 for valid time/calendar range. Clock calendar data in BCD. Automatic leap year adjustment. PM/AM = 1 for PM; PM/AM = 0 for AM. DSE = 1 enables daylight savings adjustment. 24/12 = 1 enables 24-hour data representation; 24/12 = 0 enables 12-hour data representation. Day-of-Week coded as Sunday = 1 through Saturday = 7. BVF = 1 for valid battery. STOP = 1 turns the RTC on; STOP = 0 stops the RTC in back-up mode. Table 1. bq4845 Clock and Control Register Map Aug. 1995 bq4845/bq4845Y |
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