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SLAU367P – October 2012 – Revised April 2020
Copyright © 2012–2020, Texas Instruments Incorporated
Real-Time Clock (RTC) Overview
Chapter 27
SLAU367P – October 2012 – Revised April 2020
Real-Time Clock (RTC) Overview
27.1 RTC Overview
(1)
See the device-specific data sheet.
(2)
Total adjustment range of offset calibration plus temperature compensation. See the RTC_C chapter for details.
Table 27-1. RTC Overview
Feature
RTC_B
RTC_C
LPM3.5, Calendar Mode Only
Prot Improved Calibration
and Compensation
Calendar Mode
Yes
Yes
Counter Mode
No
Optional (device-dependent)
(1)
Programmable Alarms
Yes
Yes
Password Protected Calendar Registers
No
Yes
Input Clocks
32-kHz crystal oscillator
32-kHz crystal oscillator
LPM3.5 Support
Yes
Yes
Offset Calibration Register
Yes
Yes
Temperature Compensation Register
No
Yes
Frequency Adjustment Range
-2.17 ppm × 59
≈
-128 ppm
+4.34 ppm × 59
≈
+256 ppm
-240 ppm, +240 ppm
(2)
Frequency Adjustment Steps
-2.17 ppm, +4.34 ppm
-1 ppm, +1 ppm
Temperature Compensation
With software, manipulating offset
calibration value
With software using separate
temperature compensation register
Calibration and Compensation Period
60 min
1 min
BCD to Binary Conversion
Integrated for Calendar Mode
plus separate conversion registers
Integrated for Calendar Mode
plus separate conversion registers
Event/Tamper Detect with Time Stamp
No
Optional (device-dependent)
(1)