LPC 1768 A study on Real Time clock features
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The document discusses the real-time clock (RTC) and backup registers for the LPC176x/5x microcontroller. It describes the RTC oscillator, clock control register, time counter registers, consolidated time registers, and steps for using the RTC including initializing, setting date and time, and reading date and time. Potential applications mentioned include a digital clock, timer controller, and data logging systems.
![References
[1]http://www.exploreembedded.com/wiki/LPC1768:_RTC_Programming
[2]Datasheet LPC1768
[3]Data Sheet CM-3768 Micro embedded.](https://image.slidesharecdn.com/embeddedpresentation-191127151517/85/LPC-1768-A-study-on-Real-Time-clock-features-10-320.jpg)
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LPC 1768 A study on Real Time clock features
- 1. LPC176x/5x Real-Time Clock (RTC) and backup Registers. Omkar Rane BETB118 Nikhil Patil BETB117 Kaustubh Wankhade BETB129 Block-1 Group –A ENTC
- 3. RTC oscillator The RTC oscillator provides a 1 Hz clock to the RTC and a 32 kHz clock output that can be used as the clock source for PLL0 and CPU and/or the watchdog timer. Remark: The RTC oscillator must not be used as a clock source when the PLL0 output is selected to drive the USB controller. In this case select the main oscillator as clock source for PLL0
- 4. Register in Real Time Clock
- 5. The Clock Control Register controls the operation of the clock divide circuit. Bit 0 – CLKEN : Clock Enable This bit is written with one to enable time counters and written with zero to disable time counters. Bit 1 - CTCRST : CTC Reset When this bit is set to one, the internal oscillator divider are reset. Bit 3:2 - Reserved These bits must be set to zero for normal RTC operation. Bit 4 - CCALEN : Calibration counter enable To disable calibration counter and reset it to zero, write one to this bit. When written zero, the counter is enabled and starts counting Bit 31:5 - Reserved CCR ( Clock Control Register )
- 6. Time Counter Register The time value consists of the eight counters and there is separate register associated with each counter. To update the RTC, new values should be written to these registers.
- 7. Consolidated Time Registers The values of the Time Counters can optionally be read in a consolidated format which allows the programmer to read all time counters with only three read operations. There are 3 Consolidated Time Registers. The minimum and maximum values of the various fields in these registers are same as the respective Time Counter Register. These registers are read only. New values should be written to Time Counter Registers.
- 8. Steps for Using RTC Initialize RTC •Disable RTC clock using CCR ( Clock Control Register ) •Reset clock using CCR register •Enable RTC calibration in RTC Calibration Register •Enable the clock for RTC using CCR register Set Date and Time As we saw previously, there are separate Time Counter registers for each time parameter hour, min, sec and same is the case date. We just need to copy the required values to these registers. Read Date and Time The values of date and time can be read from associated Time Counter registers. Alternately, date and time can also be read from Consolidated Time registers. We will use Time Counter registers for both reading and writing.
- 9. Application 1) Digital Clock 2) Timer Controller for water pumps. 3) Data Logging systems.