OMAP-L137 Low-Power Applications Processor
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SPRS563A–SEPTEMBER 2008–REVISED OCTOBER 2008
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Parameter : The actual receive data is 'discarded'.
Function : Wait for a minimum number of TCLK pulses.
Parameter : The count of TCLK pulses is '10'.
Function : Update the JTAG preamble and post-amble counts.
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Parameter : The IR pre-amble count is '0'.
Parameter : The IR post-amble count is '6 + 4'.
Parameter : The DR pre-amble count is '0'.
Parameter : The DR post-amble count is '1 + 1'.
Parameter : The IR main count is '4'.
Parameter : The DR main count is '1'.
6.35 Real Time Clock (RTC)
The RTC provides a time reference to an application running on the device. The current date and time is
tracked in a set of counter registers that update once per second. The time can be represented in 12-hour
or 24-hour mode. The calendar and time registers are buffered during reads and writes so that updates do
not interfere with the accuracy of the time and date.
Alarms are available to interrupt the CPU at a particular time, or at periodic time intervals, such as once
per minute or once per day. In addition, the RTC can interrupt the CPU every time the calendar and time
registers are updated, or at programmable periodic intervals.
The real-time clock (RTC) provides the following features:
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100-year calendar (xx00 to xx99)
Counts seconds, minutes, hours, day of the week, date, month, and year with leap year compensation
Binary-coded-decimal (BCD) representation of time, calendar, and alarm
12-hour clock mode (with AM and PM) or 24-hour clock mode
Alarm interrupt
Periodic interrupt
Single interrupt to the CPU
Supports external 32.768-kHz crystal or external clock source of the same frequency
Separate isolated power supply
Figure 6-69 shows a block diagram of the RTC.
Oscillator
Compensation
Week
Days
Counter
32 kHz
RTC_XI
XTAL
Hours
Days
Years
Seconds
Minutes
Months
RTC_XO
Oscillator
Alarm
Interrupts
Alarm
Periodic
Interrupts
Timer
Figure 6-69. Real-Time Clock Block Diagram
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