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AM3892 Datasheet(PDF) 264 Page - Texas Instruments |
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AM3892 Datasheet(HTML) 264 Page - Texas Instruments |
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264 / 299 page  32.768 kHz Counter 32 kHz Compensation Week Days Control Seconds Minutes Hours Days Month Years Interrupt Alarm IRQ_ALARM NIRQ_TIMER AM3894 AM3892 SPRS681A – OCTOBER 2010 – REVISED MARCH 2011 www.ti.com 8.15 Real-Time Clock (RTC) The real-time clock is a precise timer that can generate interrupts on intervals specified by the user. Interrupts can occur every second, minute, hour, or day. The clock, itself, can track the passage of real time for durations of several years, provided it has a sufficient power source the whole time. The basic purpose for the RTC is to keep time of day. The other equally important purpose of the RTC is for Digital Rights management. Some degree of tamper-proofing is needed to ensure that simply stopping, resetting, or corrupting the RTC does not go unnoticed; so, if this occurs, the application can re-acquire the time of day from a trusted source. The final purpose of RTC is to wake up the rest of the device from a power-down state. The RTC features include: • Time information (hours/minutes/seconds) directly in binary coded decimal (BCD), for easy decoding. • Calendar information (day/month/year/day of week) directly in BCD code up to year 2099. • Shadow time and calendar access; ease of reading time. • Interrupt generation, periodically (1d/1h/1m/1s) or at a precise time of day and/or date. • 30-second time correction (crystal frequency compensation). • OCP slave port for register access. • Supports power idle protocol with SWakeUp capable on alarm or timer events. The RTC is driven by SYSCLK18 (32.768 kHz) or an optional 32.768-kHz clock can be input on the CLKIN32 clock input pin for RTC reference. Figure 8-78 shows the major components of the RTC. Figure 8-78. Real-Time Clock Block Diagram 8.15.1 RTC Register Descriptions Table 8-89. RTC Registers HEX ADDRESS ACRONYM REGISTER NAME 0x480C 0000 SECONDS_REG Seconds 0x480C 0004 MINUTES_REG Minutes 0x480C 0008 HOURS_REG Hours 0x480C 000C DAYS_REG Day of the Month 0x480C 0010 MONTHS_REG Month 0x480C 0014 YEARS_REG Year 264 Peripheral Information and Timings Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): AM3894 AM3892 |
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