SWCS049D datasheet(56/119 Pages) TI1

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Hours

32-kHz Clock

Input

INT_ALARM

INT_TIMER

Seconds

Interrupt

Minutes

Week

Days

Months

Years

Control

Alarm

Frequency

Compensation

32-kHz

Counter

SWCS049-015

TPS659110, TPS659112, TPS659113

TPS659114, TPS659118, TPS6591133

SWCS049Q – JUNE 2010 – REVISED MARCH 2016

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Product Folder Links: TPS659110 TPS659112 TPS659113 TPS659114 TPS659118 TPS6591133

Detailed Description

Figure 6-5. RTC Digital Section Block Diagram

6.7.1

Time Calendar Registers

All the time and calendar information is available in these dedicated registers, called TC registers. Values

of the TC registers are written in BCD format.

1. Years data ranges from 00 to 99

–

Leap year = Year divisible by four (2000, 2004, 2008, 2012...)

–

Common year = other years

2. Months data ranges from 01 to 12

3. Days value ranges from:

–

1 to 31 when months are 1, 3, 5, 7, 8, 10, 12

–

1 to 30 when months are 4, 6, 9, 11

–

1 to 29 when month is 2 and year is a leap year

–

1 to 28 when month is 2 and year is a common year

4. Weeks value ranges from 0 to 6

5. Hours value ranges from 00 to 23 in 24-hour mode and ranges from 1 to 12 in AM/PM mode

6. Minutes value ranges from 0 to 59

7. Seconds value ranges from 0 to 59

To modify the current time, software writes the new time into TC registers to fix the time/calendar

information. The processor can write into the TC registers without stopping the RTC. In addition, software

can stop the RTC by clearing the STOP_RTC bit of the control register and check the RUN bit of the

status to be sure that the RTC is frozen, then update the TC values, and then restart the RTC by setting

STOP_RTC bit.

Example: Time is 10H54M36S PM (PM_AM mode set), 2008 September 5, previous register values are:

Table 6-4. RTC Registers Example

Value

SECONDS_REG

0x36

MINUTES_REG

0x54

SWCS049D 数据表(PDF) 56 Page - Texas Instruments

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