參數(shù)資料
型號： PWL6030B1A0CMR
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA187
封裝： 7 X 7 MM, 0.40 MM PITCH, GREEN, FCBGA-187
文件頁數(shù)： 26/97頁
文件大?。?/td> 937K
代理商： PWL6030B1A0CMR
SWCS045B
– SEPTEMBER 2010 – REVISED JUNE 2011
OPERATION
REAL-TIME CLOCK
The RTC is driven by the 32-kHz oscillator and it provides the alarm and timekeeping functions. The RTC is
supplied by the backup battery (when available) if the main battery fails and if no external power is applied.
The main functions of the RTC block are:
Time information (seconds/minutes/hours) in binary-coded decimal (BCD) code
Calendar information (day/month/year/day of the week) in BCD code up to year 2099
Programmable interrupts generation. The RTC can generate two interrupts: a timer interrupts periodically
(1s/1m/1h/1d period) and an alarm interrupt at a precise time of the day (alarm function). The timer interrupt
can be masked during the SLEEP period to prevent the host processor from waking up.
Oscillator frequency calibration and time correction
Other features are:
– Time mode switching between 12 h or 24 h at any time without disturbing the RTC (Read or write are
always performed with the current mode.)
– Shadow registers that can store time and date content and make it available and stable for reading
For security purpose, the registers related to time and calendar information are protected by restricting their write
access to software running in the secure mode of the host (MSECURE). Read access is always allowed even in
no secured mode.
NOTE
IT_ALARM can generate a wake-up of the platform.
IT_TIMER cannot generate a wake-up of the platform.
Date and Calendar Settings
All the time and calendar information are available in these dedicated registers, called TC registers. The TC
registers values are written in BCD code.
1. Year data ranges from 00 to 99:
– Leap years ≈ Years divisible by 4 (2008, 2012, etc.).
– Common years = other years.
2. Month data ranges from 01 to 12.
3. Day 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. Week value ranges from 0 to 6.
5. Hour value ranges from 00 to 23 in 24-hour mode and 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
(SECONDS_REG,
MINUTES_REG,
HOURS_REG,
DAYS_REG,
MONTHS_REG,
YEARS_REG,
and
WEEKS_REG). The DBB can write into TC registers without stopping the RTC. In addition, software can stop the
RTC by clearing the STOP_RTC bit of the RTC_CRTL_REG control register and check the RUN bit of the
RTC_STATUS_REG status register to ensure that the RTC is frozen. Then update the TC values, and restart the
RTC by setting the STOP_RTC bit.
32
Copyright
2010–2011, Texas Instruments Incorporated
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