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型號(hào)：	E5550F-DOW
廠商：	ATMEL CORP
元件分類：	通信及網(wǎng)絡(luò)
英文描述：	SPECIALTY TELECOM CIRCUIT, UUC7
封裝：	DIE-7
文件頁(yè)數(shù)：	286/1069頁(yè)
文件大?。?/td>	14303K
代理商：	E5550F-DOW

SAM4CP [DATASHEET]

43051E–ATPL–08/14

Product Dependencies

17.4.1 Power Management

The Real-time Clock is continuously clocked at 32.768 kHz. The Power Management Controller has no effect on RTC

17.4.2 Interrupt

RTC interrupt line is connected on one of the internal sources of the interrupt controller. RTC interrupt requires the

interrupt controller to be programmed first.

Functional Description

The RTC provides a full binary-coded decimal (BCD) clock that includes century (19/20), year (with leap years), month,

date, day, hours, minutes and seconds.

The valid year range is 1900 to 2099 in Gregorian mode, a two-hundred-year calendar (or 1300 to 1499 in Persian

The RTC can operate in 24-hour mode or in 12-hour mode with an AM/PM indicator.

Corrections for leap years are included (all years divisible by 4 being leap years). This is correct up to the year 2099.

The RTC can generate configurable waveforms on RTCOUT0 output.

17.5.1 Reference Clock

The reference clock is Slow Clock (SLCK). It can be driven internally or by an external 32.768 kHz crystal.

During low-power modes of the processor, the oscillator runs and power consumption is critical. The crystal selection has

to take into account the current consumption for power saving and the frequency drift due to temperature effect on the

circuit for time accuracy.

17.5.2 Timing

The RTC is updated in real time at one-second intervals in normal mode for the counters of seconds, at one-minute

intervals for the counter of minutes and so on.

Due to the asynchronous operation of the RTC with respect to the rest of the chip, to be certain that the value read in the

RTC registers (century, year, month, date, day, hours, minutes, seconds) are valid and stable, it is necessary to read

these registers twice. If the data is the same both times, then it is valid. Therefore, a minimum of two and a maximum of

three accesses are required.

17.5.3 Alarm

The RTC has five programmable fields: month, date, hours, minutes and seconds.

Each of these fields can be enabled or disabled to match the alarm condition:

If all the fields are enabled, an alarm flag is generated (the corresponding flag is asserted and an interrupt

generated if enabled) at a given month, date, hour/minute/second.

If only the “seconds” field is enabled, then an alarm is generated every minute.

Depending on the combination of fields enabled, a large number of possibilities are available to the user ranging from

minutes to 365/366 days.

Hour, minute and second matching alarm (SECEN, MINEN, HOUREN) can be enabled independently of SEC, MIN,

HOUR fields.

To change one of the SEC, MIN, HOUR, DATE, MONTH fields, it is recommended to disable the field before

changing the value and then re-enable it after the change has been made. This requires up to 3 accesses to

the RTC_TIMALR or RTC_CALALR. The first access clears the enable corresponding to the field to change

(SECEN, MINEN, HOUREN, DATEEN, MTHEN). If the field is already cleared, this access is not required. The

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E5530H-230-S8	SPECIALTY TELECOM CIRCUIT, PDSO8
E5530H-230-DOW	SPECIALTY TELECOM CIRCUIT, UUC
ECM2A5C3A12-29.939MTR	QUARTZ CRYSTAL RESONATOR, 29.939 MHz
ECM2A5C3A32-34.400M	QUARTZ CRYSTAL RESONATOR, 34.4 MHz
ED1702N	NPN general purpose transistor

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
E5550F-S8	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DIT	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DOW	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-FP008	制造商:未知廠家制造商全稱:未知廠家功能描述:TRANSPONDER\|CMOS\|SOP\|8PIN\|PLASTIC
E5552	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder

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