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M48T559Y Datasheet(PDF) 8 Page - STMicroelectronics |
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M48T559Y Datasheet(HTML) 8 Page - STMicroelectronics |
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8 / 18 page  M48T559Y 8/18 Table 10. Register Map Address Data Function/Range BCD Format D7 D6 D5 D4 D3 D2 D1 D0 1FFFh 10 Years Year Year 00-99 1FFEh 0 0 0 10 M Month Month 01-12 1FFDh 0 0 10 Date Date Date 01-31 1FFCh 0 FT 0 0 0 Day Day 01-07 1FFBh 0 0 10 Hours Hours Hour 00-23 1FFAh 0 10 Minutes Minutes Minutes 00-59 1FF9h ST 10 Seconds Seconds Seconds 00-59 1FF8h W R S Calibration Control 1FF7h WDS BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0 Watchdog 1FF6h AFE Y ABE YYYYY Interrupts 1FF5h RPT4 Y Al. 10 Date Alarm Date Alarm Date 01-31 1FF4h RPT3 Y Al. 10 Hours Alarm Hours Alarm Hours 00-23 1FF3h RPT2 Alarm 10 Minutes Alarm Minutes Alarm Minutes 00-59 1FF2h RPT1 Alarm 10 Seconds Alarm Seconds Alarm Seconds 00-59 1FF1h YYY YYYYY Unused 1FF0h WDF AF Z BL ZZZZ Flags Keys: S = SIGN Bit FT = FREQUENCY TEST Bit R = READ Bit W = WRITE Bit ST = STOP Bit 0 = Must be set to zero Y = ’1’ or ’0’ Z = ’0’ and are Read only AF = Alarm Flag BL = Battery Low WDS = Watchdog Steering Bit BMB0-BMB4 = Watchdog Multiplier Bits RB0-RB1 = Watchdog Resolution Bits AFE = Alarm Flag Enable ABE = Alarm in Battery Back-up Mode Enable RPT1-RPT4 = Alarm Repeat Mode Bits WDF = Watchdog Flag The M48T559Y may respond to transient noise spikes on VCC that reach into the deselect window during the time the device is sampling VCC. There- fore, decoupling of the power supply lines is rec- ommended. When VCC drops below VSO, the control circuit switches power to the internal battery which pre- serves data and powers the clock. The internal button cell will maintain data in the M48T559Y for an accumulated period of at least 7 years when VCC is less than VSO. As system power returns and VCC rises above VSO, the battery is discon- nected, and the power supply is switched to exter- nal VCC. Write protection continues until VCC reaches VPFD (max) plus tREC. For more informa- tion on Battery Storage Life refer to the Application Note AN1012. POWER-ON RESET The M48T559Y continuously monitors VCC. When VCC falls to the power fail detect trip point, the RST pulls low (open drain) and remains low on power- up for 40ms to 200ms after VCC passes VPFD. An external pull-up resistor to VCC is required (1kΩ re- sistor is recommended). The reset pulse remains active with VCC at VSS. |
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