RTCC with Timestamp HIGHLIGHTS This section of the manual contains the following major topics: 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 Introduction ....................................................................................................................... 2 Registers........................................................................................................................... 3 Operation ........................................................................................................................ 12 Alarm............................................................................................................................... 18 Power Control ................................................................................................................. 20 Timestamping.................................................................................................................. 24 Interrupts......................................................................................................................... 24 Resets ............................................................................................................................. 25 Operation in Power-Saving Modes ................................................................................. 25 Peripheral Module Disable (PMD) Register .................................................................... 25 Register Maps ................................................................................................................. 26 Related Application Notes............................................................................................... 27 Revision History .............................................................................................................. 28 2014 Microchip Technology Inc. DS70005193A-page 1 dsPIC33/PIC24 Family Reference Manual 1.0 INTRODUCTION The Real-Time Clock and Calendar (RTCC) hardware module is intended for applications where accurate time must be maintained for extended periods of time with minimum to no intervention from the CPU. The module is optimized for low-power usage in order to provide extended battery lifetime while keeping track of time. Key features of this module include: • Time (Hours, Minutes and Seconds) in 24-Hour (Military Time) Format • Calendar (Weekday, Date, Month and Year) - Year Range from 2000 to 2099 with Automatic Leap Year Correction • Alarm with Configurable Mask and Repeat Options • BCD Format for Compact Firmware • Optimized for Low-Power Operation • Multiple Clock Input Options, Including 32.768 kHz Crystal and Power Line • User Calibration Within 2 ppm When Using 32 kHz Source • Interrupt on Alarm and Timestamp Events • Timestamp Feature for Date and Time Capture from Multiple Trigger Events • User-Configurable Power Control with Dedicated Output Pin to Periodically Wake External Devices The RTCC module is a 100-year clock and calendar with automatic leap year detection. The range of the clock is from 00:00:00 (midnight) on January 1, 2000 to 23:59:59 on December 31, 2099. The hours are available in 24-hour format. The clock provides a granularity of one second with half second visibility to the user. Figure 1-1: RTCC High-Level Block Diagram RTCC Clock Domain CPU Clock Domain RTCCON1H RTCC Timer RTCCON1L TIMEH RTCCON2H TIMEL RTCCON2L DATEH RTCCON3L DATEL RTCSTATL PWRLCLK SOSC LPRC RTCC Prescaler/ Clock Divider FCY 0.5s ALMTIMEH Alarm and Repeat Logic Comparator with Masks ALMTIMEL ALMDATEH ALMDATEL TS(A/B)TIMEH Timestamp Logic TS(A/B)TIMEL TS(A/B)DATEH TS(A/B)DATEL RTCC Interrupt Interrupt Logic RTCC Pin Pin Control RTCOE PWRGT PWC Logic PWCOE DS70005193A-page 2 2014 Microchip Technology Inc. RTCC with Timestamp 2.0 REGISTERS The RTCC module uses a total of 22 registers, which are organized into four categories. 2.1 Control and Status Registers RTCCON1L (Register 2-1) is the main control register for the RTCC. Power control features, pin control and timestamping are controlled through this register. RTCCON1H (Register 2-2) controls alarm functionality, including alarm mask configuration and alarm repeat. RTCCON2L (Register 2-3) controls the RTCC prescalers; it is used to configure the prescaler to generate the 0.5s signal used to drive the timer. It also controls calibration functions. RTCCON2H (Register 2-4) contains the value of DIV<15:0>, the 16-bit coarse clock divider; the value stored here is used by the RTCC prescaler to generate a nominal 0.5s timer signal. RTCCON3L (Register 2-5) controls the Sampling and Stability windows for the power control functionality. RTCSTATL (Register 2-6) contains the event flag status bits for timestamps, calibration and timer synchronization. 2.2 Time and Date Registers Four registers are used to store current time and date information in BCD format: • • • • TIMEH (Register 2-7) holds the current time hours and minutes value. TIMEL (Register 2-8) holds the current time seconds value. DATEH (Register 2-9) holds the current year and month value. DATEL (Register 2-10) holds the current date and weekday value. 2.3 Alarm Registers Four registers are used to store the alarm value time and date value. They are formatted identically to the Time and Date registers. • • • • ALMTIMEH (see Register 2-7 for format) ALMTIMEL (see Register 2-8 for format) ALMDATEH (see Register 2-9 for format) ALMDATEL (see Register 2-10 for format) 2.4 Timestamp Registers Each of the timestamps (Timestamp A and Timestamp B) have a set of four Time and Date registers associated with them. They are normally 16-bit Data registers; when timestamp data is stored in them, they assume the data formatting associated with the corresponding Time and Date registers. • • • • TSATIMEH and TSBTIMEH (see Register 2-7 for format) TSATIMEL and TSBTIMEL (see Register 2-8 for format) TSADATEH and TSBDATEH (see Register 2-9 for format) TSADATEL and TSBDATEL (see Register 2-10 for format) 2014 Microchip Technology Inc. DS70005193A-page 3 dsPIC33/PIC24 Family Reference Manual 2.5 RTCC Register Write Lock To prevent spurious changes to the Time Control or Time Value registers, the WRLOCK bit (RTCCON1L<11>) must be cleared first. By default, WRLOCK is cleared on any device Reset. It is recommended that WRLOCK be set after the Date and Time registers are properly initialized, and the RTCEN bit (RTCCON1L<15>) has been set. Any attempt to write to the RTCEN bit, the RTCCON2 registers, or the Date or Time registers, will be ignored as long as WRLOCK = 1. Alarm, power control and timestamping features may be changed regardless of the state of WRLOCK. Clearing the WRLOCK bit requires an unlock sequence, writing two bytes consecutively to the NVMKEY register. A sample assembly sequence is shown in Example 2-1. If WRLOCK is already clear, it can be set (= 1) without using the unlock sequence. Example 2-1: DISI MOV #6 #NVMKEY,W1 MOV MOV MOV MOV BCLR #0x55, W2 W2, [W1] #0xAA, W3 W3, [W1] RTCCON1L,#WRLOCK Note: DS70005193A-page 4 Clearing the WRLOCK Bit ; Refer to specific device data sheet. Register ; used for unlock sequence is device-specific. To avoid accidental writes to the timer, it is recommended that the WRLOCK bit be kept set at any other time. For the WRLOCK bit to be cleared, there is only one instruction cycle time window allowed between the 55h/AA sequence and the clearing of WRLOCK; therefore, it is recommended to use the code example in Example 2-1. 2014 Microchip Technology Inc. RTCC with Timestamp 2.6 RTCC Control Registers Register 2-1: RTCCON1L: RTCC Control 1 Low Register R/W-0 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 RTCEN — — — WRLOCK PWCEN PWCPOL PWCOE bit 15 bit 8 R/W-0 R/W-0 R/W-0 R/W-0 U-0 U-0 R/W-0 R/W-0 RTCOE OUTSEL2 OUTSEL1 OUTSEL0 — — TSBEN TSAEN bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15 RTCEN: RTCC Enable bit 1 = RTCC is enabled and counts from selected clock source 0 = RTCC module is disabled bit 14-12 Unimplemented: Read as ‘0’ bit 11 WRLOCK: RTCC Registers Write Lock Bit 1 = Registers associated with accurate timekeeping are locked 0 = Registers associated with accurate timekeeping may be written by user bit 10 PWCEN: Power Control Enable bit 1 = Power control is enabled 0 = Power control is disabled bit 9 PWCPOL: Power Control Polarity bit 1 = Power control output is active-high 0 = Power control output is active-low bit 8 PWCOE: Power Control Output Enable bit 1 = Power control output pin is enabled 0 = Power control output pin is disabled bit 7 RTCOE: RTCC Output Enable bit 1 = RTCC clock output is enabled; signal selected by OUTSEL<2:0> is presented on the RTCC pin 0 = RTCC clock output is disabled bit 6-4 OUTSEL<2:0>: RTCC Signal Output Selection bits 11x = Unused 101 = Timestamp B event 100 = Timestamp A event 011 = Power control output (PWRGT function on RTCC pin) 010 = RTCC input clock source 001 = Seconds clock 000 = Alarm event bit 3-2 Unimplemented: Read as ‘0’ bit 1 TSBEN: Timestamp Source B Enable bit 1 = Timestamp Source B signal generates a timestamp event 0 = Timestamp Source B signal is disabled bit 0 TSAEN: Timestamp Source A Enable bit 1 = Timestamp Source A signal will generate a timestamp event 0 = Timestamp Source A signal is disabled 2014 Microchip Technology Inc. DS70005193A-page 5 dsPIC33/PIC24 Family Reference Manual Register 2-2: RTCCON1H: RTCC Control 1 High Register R/W-0 R/W-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 ALRMEN CHIME — — AMASK3 AMASK2 AMASK1 AMASK0 bit 15 bit 8 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 ALMRPT7(1) ALMRPT6(1) ALMRPT5(1) ALMRPT4(1) ALMRPT3(1) ALMRPT2(1) ALMRPT1(1) ALMRPT0(1) bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15 ALRMEN: Alarm Enable bit 1 = Alarm is enabled 0 = Alarm is disabled bit 14 CHIME: Chime Enable bit 1 = Chime is enabled; ALMRPT<7:0> bits are allowed to underflow from ‘00’ to ‘FF’ 0 = Chime is disabled; ALMRPT<7:0> bits stop once they reach ‘00’ bit 13-12 Unimplemented: Read as ‘0’ bit 11-8 AMASK<3:0>: Alarm Mask Configuration bits 11xx = Reserved, do not use 101x = Reserved, do not use 1001 = Once a year (or once every 4 years when configured for February 29th) 1000 = Once a month 0111 = Once a week 0110 = Once a day 0101 = Every hour 0100 = Every 10 minutes 0011 = Every minute 0010 = Every 10 seconds 0001 = Every second 0000 = Every half second bit 7-0 ALMRPT<7:0>: Alarm Repeat Counter Value bits(1) 11111111 = Alarm will repeat 255 more times 11111110 = Alarm will repeat 254 more times ••• 00000010 = Alarm will repeat 2 more times 00000001 = Alarm will repeat 1 more time 00000000 = Alarm will not repeat Note 1: The counter decrements on any alarm event. The counter is prevented from rolling over from ‘00’ to ‘FF’ unless CHIME = 1. DS70005193A-page 6 2014 Microchip Technology Inc. RTCC with Timestamp Register 2-3: RTCCON2L: RTCC Control 2 Low Register R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0 U-0 U-0 FDIV4 FDIV3 FDIV2 FDIV1 FDIV0 — — — bit 15 bit 8 R/W-0 R/W-0 R/W-0 R/W-0 U-0 U-0 R/W-0 R/W-0 PWCPS1 PWCPS0 PS1 PS0 — — CLKSEL1 CLKSEL0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15-11 FDIV<4:0>: Fractional Clock Divide bits 11111 = Clock period increases by 31 RTCC input clock cycles every 16 seconds 11101 = Clock period increases by 30 RTCC input clock cycles every 16 seconds ••• 00010 = Clock period increases by 2 RTCC input clock cycles every 16 seconds 00001 = Clock period increases by 1 RTCC input clock cycle every 16 seconds 00000 = No fractional clock division bit 10-8 Unimplemented: Read as ‘0’ bit 7-6 PWCPS<1:0>: Power Control Prescale Select bits 11 = 1:256 10 = 1:64 01 = 1:16 00 = 1:1 bit 5-4 PS<1:0>: Prescale Select bits 11 = 1:256 10 = 1:64 01 = 1:16 00 = 1:1 bit 3-2 Unimplemented: Read as ‘0’ bit 1-0 CLKSEL<1:0>: Clock Select bits 11 = Peripheral clock (FCY) 10 = PWRLCLK input pin 01 = LPRC 00 = SOSC 2014 Microchip Technology Inc. DS70005193A-page 7 dsPIC33/PIC24 Family Reference Manual Register 2-4: RTCCON2H: RTCC Control 2 High Register R/W-0 R/W-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 DIV<15:8> bit 15 bit 8 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 DIV<7:0> bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared bit 15-0 x = Bit is unknown DIV<15:0>: Clock Divide bits Sets the period of the clock divider counter; value should cause a nominal 1/2 second underflow. Register 2-5: RTCCON3L: RTCC Control 3 Low Register R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 PWCSAMP7 PWCSAMP6 PWCSAMP5 PWCSAMP4 PWCSAMP3 PWCSAMP2 PWCSAMP1 PWCSAMP0 bit 15 bit 8 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 PWCSTAB7 PWCSTAB6 PWCSTAB5 PWCSTAB4 PWCSTAB3 PWCSTAB2 PWCSTAB1 PWCSTAB0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared bit 15-8 PWCSAMP<7:0>: Power Control Sample Time Window bits 11111111 = Sample input is always allowed (not gated) 11111110 = Sample Time window is 254 TPWC ••• 00000010 = Sample Time window is 2 TPWC 00000001 = Sample Time window is 1 TPWC 00000000 = Sample input is always gated bit 7-0 PWCSTAB<7:0>: Power Control Stability Time bits 11111111 = Stability Time window is 255 TPWC 11111110 = Stability Time window is 254 TPWC ••• 00000010 = Stability Time window is 2 TPWC 00000001 = Stability Time window is 1 TPWC 00000000 = No Stability Time window DS70005193A-page 8 x = Bit is unknown 2014 Microchip Technology Inc. RTCC with Timestamp Register 2-6: RTCSTATL: RTCC Status Low Register U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0 — — — — — — — — bit 15 bit 8 R-0, HSC U-0 R/C-0, HSC R/W-0, HSC R/W-0, HSC R-0, HSC R-0, HSC R-0, HSC CPLCK — ALMEVT TSBEVT(1) TSAEVT(1) SYNC ALMSYNC HALFSEC bit 7 bit 0 Legend: C = Clearable Only bit HSC = Hardware Settable/Clearable bit R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15-8 Unimplemented: Read as ‘0’ bit 7 CPLCK: Calibration PLL Lock Status bit 1 = External calibration PLL is locked; 1 second clock output is valid 0 = External calibration PLL is not locked bit 6 Unimplemented: Read as ‘0’ bit 5 ALMEVT: Alarm Event bit 1 = An alarm event has occurred 0 = An alarm event has not occurred bit 4 TSBEVT: Timestamp B Event bit(1) 1 = A Timestamp B event has occurred 0 = A Timestamp B event has not occurred bit 3 TSAEVT: Timestamp A Event bit(1) 1 = A Timestamp A event has occurred 0 = A Timestamp A event has not occurred bit 2 SYNC: Synchronization Status bit 1 = Time registers may change during software read 0 = Time registers may be read safely bit 1 ALMSYNC: Alarm Synchronization status bit 1 = Alarm registers (ALMTIMEL/H and ALMDATEL/H) and RTCCON1H should not be modified; ALRMEN and ALMRPT<7:0> bits may change during software read 0 = Alarm registers and Alarm Control registers may be modified safely bit 0 HALFSEC: Half Second Status bit 1 = Second half of 1 second period 0 = First half of 1 second period Note 1: Software may write a ‘1’ to this bit to initiate a timestamp event; the event capture is not valid until the bit reads as ‘1’. 2014 Microchip Technology Inc. DS70005193A-page 9 dsPIC33/PIC24 Family Reference Manual 2.7 Time/Alarm/Timestamp Registers TIMEH/ALMTIMEH/TSATIMEH/TSBTIMEH: Upper Time (Hour/Minute) Registers(1) Register 2-7: U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — — HRTEN1 HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0 bit 15 bit 8 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15-14 Unimplemented: Read as ‘0’ bit 13-12 HRTEN<1:0>: Binary Coded Decimal Value of Hours bits (10-digit) Contains a value from 0 to 2. bit 11-8 HRONE<3:0>: Binary Coded Decimal Value of Hours bits (1-digit) Contains a value from 0 to 9. bit 7 Unimplemented: Read as ‘0’ bit 6-4 MINTEN<2:0>: Binary Coded Decimal Value of Minutes bits (10-digit) Contains a value from 0 to 5. bit 3-0 MINONE<3:0>: Binary Coded Decimal Value of Minutes bits (1-digit) Contains a value from 0 to 9. Note 1: A write to this register is only allowed when RTCWREN = 1. TIMEL/ALMTIMEL/TSATIMEL/TSBTIMEL: Lower Time (Seconds) Registers(1) Register 2-8: U-0 — R/W-0 SECTEN2 R/W-0 SECTEN1 R/W-0 SECTEN0 R/W-0 SECONE3 R/W-0 SECONE2 R/W-0 SECONE1 R/W-0 SECONE0 bit 15 bit 8 U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0 — — — — — — — — bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared bit 15 bit 14-12 Unimplemented: Read as ‘0’ SECTEN<2:0>: Binary Coded Decimal Value of seconds bits (10-digit) Contains a value from 0 to 5. bit 11-8 SECONE<3:0>: Binary Coded Decimal Value of seconds bits (1-digit) Contains a value from 0 to 9. bit 7-0 Unimplemented: Read as ‘0’ Note 1: x = Bit is unknown A write to this register is only allowed when RTCWREN = 1. DS70005193A-page 10 2014 Microchip Technology Inc. RTCC with Timestamp Register 2-9: DATEH/ALMDATEH/TSADATEH/TSBDATEH: Upper Date (Month/Year) Registers R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 YRTEN3 YRTEN2 YRTEN1 YRTEN0 YRONE3 YRONE2 YRONE1 YRONE0 bit 15 bit 8 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — — — MTHTEN MTHONE3 MTHONE2 MTHONE1 MTHONE0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15-12 YRTEN<3:0>: Binary Coded Decimal Value of Years bits (10-digit) bit 11-8 YRONE<3:0>: Binary Coded Decimal Value of Years bits (1-digit) bit 7-5 Unimplemented: Read as ‘0’ bit 4 MTHTEN: Binary Coded Decimal Value of Months bits (10-digit) Contains a value from 0 or 1. bit 3-0 MTHONE<3:0>: Binary Coded Decimal Value of Months bits (1-digit) Contains a value from 0 to 9. Register 2-10: DATEL/ALMDATEL/TSADATEL/TSBDATEL: Lower Date (Day/Date) Registers U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — — DAYTEN1 DAYTEN0 DAYONE3 DAYONE2 DAYONE1 DAYONE0 bit 15 bit 8 U-0 U-0 U-0 U-0 U-0 R/W-1 R/W-1 R/W-0 — — — — — WDAY2 WDAY1 WDAY0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared bit 15-14 Unimplemented: Read as ‘0’ bit 13-12 DAYTEN<1:0>: Binary Coded Decimal Value of Days bits (10-digit) Contains a value from 0 to 3. bit 11-8 DAYONE<3:0>: Binary Coded Decimal Value of Days bits (1-digit) Contains a value from 0 to 9. bit 7-3 Unimplemented: Read as ‘0’ bit 2-0 WDAY<2:0>: Binary Coded Decimal Value of Weekdays bits (1-digit) Contains a value from 0 to 6. 2014 Microchip Technology Inc. x = Bit is unknown DS70005193A-page 11 dsPIC33/PIC24 Family Reference Manual 3.0 OPERATION 3.1 Register Interface The register interface for the RTCC and alarm values is implemented using natural Binary Coded Decimal (BCD) format. This simplifies the firmware, when using the module, as each of the digit values is contained within its own 4-bit value (see Figure 3-1). Figure 3-1: Timer and Alarm Digit Format TIME AND DATE BCD YEAR 0-9 0-9 HOURS (24-hr format) 0-2 DAY MONTH 0-9 0-1 0-9 MINUTES 0-5 0-9 0-3 DAY OF WEEK 0-9 SECONDS 0-5 0-9 0-6 1/2 SECOND BIT (binary format) 0/1 ALARM BCD DAY MONTH 0-1 HOURS (24-hr format) 0-2 0-9 3.2 0-9 MINUTES 0-5 0-9 0-3 DAY OF WEEK 0-9 0-6 SECONDS 0-5 0-9 General Functionality All Timer registers containing a time value of seconds or greater are writable. The user can configure the time by writing the desired year, month and day to the DATEL and DATEH registers; and the hour, minutes and seconds to the TIMEL and TIMEH registers. The timer will then use the newly written values and proceed with the count from the desired starting point. The RTCC module is enabled by setting the RTCEN bit (RTCCON1L<15>). If enabled while adjusting these registers, the timer will still continue to increment. The user has visibility to the half second field of the counter, HALFSEC (RTCSTATL<0>). This value is read-only, and can only be reset by writing to SECONE<3:0> (TIMEL<11:8>). DS70005193A-page 12 2014 Microchip Technology Inc. RTCC with Timestamp 3.3 Synchronization Because the CPU and the RTCC operate in different clock domains, care must be taken when reading and writing the RTCC registers. The user is responsible to assure that when RTCEN = 1, the updated registers will not be incremented at the same time. This can be accomplished in several ways: • Checking the SYNC bit (RTCSTATL<2>); • Checking the preceding digits from which a carry can occur; or • Updating the registers immediately following the seconds pulse (or alarm interrupt). The SYNC bit indicates a time window during which the RTCC Clock Domain registers can be safely read and written without concern about a rollover. When SYNC = 0, the registers can be safely accessed by the CPU. Whether SYNC = 1 or 0, the user should employ a firmware solution to assure that the data read did not fall on a rollover boundary, resulting in an invalid or partial read. This firmware solution would consist of reading each register twice and then comparing the two values. If the two values match, then a rollover did not occur. 3.4 Digit Carry Rules Certain timer values are affected when there is a rollover: • Time of Day: from 23:59:59 to 00:00:00 with a carry to the day field • Day of Week: from 6 to 0 with no carry (refer to Table 3-1 for values) • Day (DAYONEx and DAYTENx fields together): from 28, 29, 30 or 31, with a carry to the month field (refer to Table 3-2 for the schedule) • Month (MTHONEx and MTHTEN fields together): from 12/31 to 01/01 with a carry to the year field • Year Carry: from 99 to 00; this also surpasses the use of the RTCC Table 3-1: Day of Week Schedule Table 3-2: Day of Week WDAY Value Sunday 0 Monday 1 Tuesday 2 Wednesday 3 Thursday 4 Friday 5 Saturday 6 Day to Month Rollover Schedule Month Maximum Day Field Month Maximum Day Field 01 (January) 31 07 (July) 31 02 (February) 03 (March) 28 or 29 31 (1) 08 (August) 31 09 (September) 30 04 (April) 30 10 (October) 31 05 (May) 31 11 (November) 30 06 (June) 30 12 (December) 31 Note 1: 2014 Microchip Technology Inc. See Section 3.4.1 “Leap Year” for details. DS70005193A-page 13 dsPIC33/PIC24 Family Reference Manual As the module uses BCD format, the carry to the upper BCD digit occurs at a count of 10 and not a count of 16 for these fields: • • • • • • SEC MIN HR WDAY DAY MON 3.4.1 LEAP YEAR Since the year range on the RTCC module is 2000 to 2099, the leap year calculation is determined by any year, divisible by 4, in the above range. The only month to be affected in a leap year is February. The month of February will have 29 days in a leap year, while any other year, it will have 28 days. 3.5 Clock Source The RTCC clock source is selected with the CLKSEL<1:0> bits (RTCCON2L<1:0>). It is designed to operate from any one of four clock sources: • • • • The crystal-controlled 32.768 kHz Secondary Oscillator (SOSC) The Internal Low-Power RC 31 kHz Oscillator (LPRC) The microcontroller peripheral clock, operating at the instruction frequency (FCY) The PWRLCLK pin input, generally derived from the local mains frequency (50/60 Hz) Each option provides users with choices of application component count and accuracy over time. The Secondary Oscillator (SOSC) provides the highest accuracy and lowest power consumption option. When used as the source, calibration of the crystal can be accomplished through this module yielding an error of 3 seconds or less per month. See Section 3.6 “Clock Calibration” for further details. Figure 3-2: Clock Source Multiplexing and Divider Chain CLKSEL<1:0> PS<1:0> DIV<15:0> FDIV<4:0> 1:1/16/64/256 Prescaler Variable Clock Divider SOSC LPRC FCY PWRLCLK (50/60 Hz) 1/2s Clock (2 Hz) 1/2 sec(1) 1s Clock sec Note 1: hr:min Day Day of Week Month Year Writing to the TIMEL register resets all counters, allowing fraction of a second synchronization. Clock prescalers are held in Reset when RTCEN = 0. DS70005193A-page 14 2014 Microchip Technology Inc. RTCC with Timestamp 3.5.1 CLOCK DIVIDER The RTCC timer must be provided with a 1/2 second (2 Hz) clock source. This is done by selecting appropriate values for the clock prescaler and the variable clock divider. The clock prescaler divides the input clock by one of four fixed ratios. It is controlled by the PS<1:0> bits (RTCCON2L<5:4>). Divider options are 1:1, 1:16, 1:64 and 1:256. The variable coarse clock divider further divides the clock input from the prescaler. It provides the entire range of integer divisor options, from 1:1 to 1:32,768. It is controlled by the DIV<15:0> bits field (RTCCON2H<15:0>). The clock divider also has a fine divider, controlled by the FDIV<4:0> bits. This permits fine frequency adjustments to the timer output. This is discussed in Section 3.6 “Clock Calibration”. Selection of a particular clock input with the CLKSELx bits does not automatically select an appropriate prescaler or clock divider option. It is the user’s responsibility to configure the prescaler and divider correctly to provide a 2 Hz signal to the timer. Table 3-3 lists the most common combinations for typical clock sources. Equation 3-1 shows how to calculate the prescaler and DIVx values for any input frequency. Table 3-3: Clock Divider vs. Input Frequency (Nominal Clock Frequencies) Input Frequency Prescaler DIV<15:0> FDIV<4:0> 32,768 kHz 1:1 3FFF 00000 60 Hz 1:1 1D 00000 1:1 18 00000 1:256 7A11 00000 50 Hz 16 MHz Equation 3-1: RTCC Clock Frequency Divider Output Frequency FOUT = FIN 1 • FDIV<4:0> Prescale • (DIV<15:0> + 1) + 2 32 Where: DIV<15:0> = FIN –1 2 • PRESCALE and FDIV<4:0> is the fractional remainder of DIV<15:0>, multiplied by 32 3.5.2 SECONDARY OSCILLATOR (SOSC) ENABLE If the RTCC is configured to use the Secondary Oscillator, it will automatically be enabled when the RTCC is enabled. The SOSCEN bit (OSCCON<1>) does not need to be set. For more information on the Secondary Oscillator, refer to the “Oscillator Configuration” chapter of the device data sheet. 3.5.3 LOW-POWER RC OSCILLATOR ENABLE If the RTCC is configured to be clocked by LPRC, the LPRC will automatically be enabled. Refer to the “Oscillator Configuration” chapter of the device data sheet for more information on the LPRC. 2014 Microchip Technology Inc. DS70005193A-page 15 dsPIC33/PIC24 Family Reference Manual 3.5.4 CLOCK SOURCE FROM POWER LINE (50/60 HZ SIGNAL) It is possible to use the power mains as an external clock source for the RTCC. The module can use either 50 or 60 Hz AC, to accommodate local power in most locations throughout the world. Line voltage cannot be used directly to provide the clock reference. For safety reasons, the line voltage must be properly isolated from the digital portion of the application. Failure to properly design the circuitry that interfaces mains voltage to the microcontroller may result in a fatal shock. Figure 3-3 shows a suggested signal conditioning circuit for such a clock source. Figure 3-3: Suggested Signal Conditioning for 50/60 Hz RTCC Clock Input High Voltage VDD VDD PWRLCLK PIC24 MCU dsPIC33 DSC Opto-Isolator 120/240V 50/60 Hz AC Input VSS Earth Ground 3.6 Digital Ground Clock Calibration In addition to the 16-bit coarse divider (DIV<15:0>), the variable clock divider also uses a fine clock frequency divisor to make small trim adjustments to the nominal 0.5s timer signal. This fine divider, FDIV<4:0> (RTCCON2L<15:11>), acts as the fractional part of a 21-bit clock divider when used with DIV<15:0>. The fine divider operates on the variable clock divider output every 1/2 second, optionally omitting a clock cycle. This effectively stretches the period set by the period counter by one clock cycle. When FDIV<4:0> = 01h, it takes 16 seconds to remove a clock cycle and see any effect on the output. The maximum effect is when FDIV<4:0> = 31 (decimal), which represents 31 clock cycles removed over 16 seconds. When FDIV<4:0> = 0, the clock period is not affected by the fine divider. Deviation from the desired input frequency is adjusted by changing the values of DIVx and FDIVx accordingly, as calculated by Equation 3-1. A faster than desired oscillator generally requires increases to the value of FDIVx for small changes, or decreases to the value of DIVx for large changes. On the other hand, a slow oscillator requires decreases to the value of FDIVx, or increases to the value of DIVx. Table 3-4 shows the effect of changing DIVx and FDIVx; Example 3-1 demonstrates the calculation of FDIVx in these cases. DS70005193A-page 16 2014 Microchip Technology Inc. RTCC with Timestamp The fine clock divider is optimized to provide an adjustment error of less than 2 ppm when operating from a crystal-controlled 32.768 kHz oscillator. Even so, it is effective for fine-tuning the timer signal frequency, regardless of the clock input. Note: Before calibration, the user must determine the error of the crystal. This should be done using another timer resource on the device or an external timing reference. It is the user’s responsibility to include in the error value the initial error of the crystal, drift due to temperature and drift due to crystal aging. Table 3-4: Clock Divider vs. Input Frequency (Showing Fine-Tuning Options) Input Frequency Prescaler DIV<15:0> FDIV<4:0> 32,767.9 kHz(1) 1:1 3FFE 1E 32,768.0 kHz 1:1 3FFF 00 32.768.3 kHz 1:1 3FFF 05 59.9 Hz(1) 1:1 1C 1E 60 Hz 1:1 1D 00 60.1 Hz(1) 1:1 1D 02 (1) Note 1: These selections are provided to demonstrate settings for a clock source slightly faster or slower than the desired output frequency. Example 3-1: Clock Divider Calculation (with FDIV<4:0>) FIN = 32767.8 Hz (Oscillator running slow) Prescaler = 1:1 Divide Ratio = 32767.8/2 – 1 = 16382.9 Therefore, DIV<15:0> = 16382 and FDIV<4:0> = 32(0.9) = 29 3.7 RTCC Pin The RTCC pin can be configured by the OUTSEL<2:0> bits (RTCCON1L<6:4>) to present any one of several outputs: • • • • One second clock pulse A direct pass-through of the RTCC input clock source Alarm signal (see Section 4.0 “Alarm”for details) Power control pin, in addition to or as an alternative to the PWRGT pin (see Section 5.0 “Power Control” for details) • Timestamp events (see Section 6.0 “Timestamping” for details) When used as an output, the RTCC Output Enable bit, RTCOE (RTCCON1L<7>), must also be set. 2014 Microchip Technology Inc. DS70005193A-page 17 dsPIC33/PIC24 Family Reference Manual 4.0 ALARM The RTCC alarm includes these features: • Configurable from half second to one year • One-time alarm and repeat alarm options available 4.1 Configuring the Alarm The alarm feature is enabled by setting the ALRMEN bit (RTCCON1H<15>). This bit is cleared by hardware when an alarm is issued, but is not cleared if the CHIME bit (RTCCON1H<14>) = 1, or if ALMRPT<7:0> (RTCCON1H<7:0>) has any value other than 00h. The interval selection of the alarm is configured through the AMASK<3:0> bits (RTCCON1H<11:8>). These bits determine which and how many digits of the alarm must match the clock value for the alarm to occur. Figure 4-1 shows the available alarm mask options. Note: Figure 4-1: Changing any of the control bits, other than RTCOE, ALMRPT<7:0> and CHIME, while the alarm is enabled (ALRMEN = 1), can result in a false alarm event leading to a false alarm interrupt. To avoid a false alarm event, change the timer and alarm values only while the alarm is disabled (ALRMEN = 0). It is recommended that these bits be changed when ALMSYNC = 0. Alarm Mask Settings Alarm Mask Setting AMASK<3:0> Day of the Week Month Day Hours Minutes Seconds 0000 – Every half second 0001 – Every second 0010 – Every 10 seconds s 0011 – Every minute s s m s s m m s s 0100 – Every 10 minutes 0101 – Every hour 0110 – Every day 0111 – Every week d 1000 – Every month 1001 – Every year(1) Note 1: m m h h m m s s h h m m s s d d h h m m s s d d h h m m s s Annually, except when configured for February 29. DS70005193A-page 18 2014 Microchip Technology Inc. RTCC with Timestamp 4.2 Alarm Repeat and Chime The alarm can also be configured to repeat based on a preconfigured interval. The amount of times this occurs once the alarm is enabled is determined by the ALMRPT<7:0> bits. The alarm can be repeated up to 255 times. When ALMRPT<7:0> = 00h and CHIME = 0, the repeat function is disabled and only a single alarm will occur. After each alarm is issued, the ALMRPT<7:0> bits are decremented by one. Once the bit field has reached ‘00’, the alarm will be issued one last time, after which, the ALRMEN bit is cleared automatically and the alarm is turned off. Indefinite repetition of the alarm can occur if the CHIME bit = 1. Instead of the alarm being disabled when the ALMRPT<7:0> bits reach 00h, the value of the bit field rolls over to FFh and continues to count down indefinitely. 4.3 Alarm Interrupt An interrupt is generated at every alarm event. When an event occurs, the ALMEVT bit (RTCSTATL<5>) is set. This allows the application to distinguish an alarm interrupt from other interrupt events, if necessary. The application should clear ALMEVT after an RTCC interrupt in order to distinguish additional alarm events (or other interrupts if they are enabled). 4.4 Alarm Output In addition to the alarm interrupt, an alarm pulse output is provided that operates at half the frequency of the alarm. This output is completely synchronous to the RTCC clock and can be used as a trigger clock to other peripherals. This output is available on the RTCC pin. The output pulse is a clock with a 50% duty cycle and a frequency half that of the alarm event (see Figure 4-2). The alarm output pulse is presented on the RTCC pin whenever the OUTSEL<2:0> bits (RTCCON1L<6:4>) = 000. The RTCC Output Enable bit, RTCOE (RTCCON1L<7>), must also be set. Note: Figure 4-2: When the timer value reaches that of the Alarm registers, one period of the RTCC clock will elapse before the alarm interrupt is set. As a result, the application will see the timer value at the alarm value before the interrupt has occurred. Timer Pulse Generation RTCEN bit ‘1’ ALRMEN bit RTCC Alarm Event RTCC Pin 2014 Microchip Technology Inc. DS70005193A-page 19 dsPIC33/PIC24 Family Reference Manual 5.0 POWER CONTROL The RTCC includes a power control feature that allows the device to periodically wake up an external device, wait for the device to be stable before sampling wake-up events from that device and then shut down the external device. This can be done completely autonomously by the RTCC without the need to wake from the current lower power mode (Sleep, Deep Sleep, etc.). The power control feature uses the PWRGT output pin; the RTCC output pin may also be used with PWRGT, or as an alternative. (Select devices may only use the RTCC pin for power control. Refer to the device data sheet for more information.) Two possible control circuits for this feature are shown in Figure 5-1. The WAKE pin in both examples represents an input that would wake up the device in the desired circumstances (e.g., INT0 in Deep Sleep, any enabled interrupt in Sleep, etc.). The top of the figure illustrates a situation in which the external device requires more current than the I/O pin can reliably generate. Note that the power control polarity is active-low in order to provide the external device power at the correct times. A more straightforward approach is shown in the bottom of the figure. For external devices, whose current consumption is within the range an I/O pin can provide (approximately 20 mA), the device can be powered directly via the PWRGT or RTCC pin. If the device requires a stabilizing capacitor on VDD, this method could result in a significant current load. To use this layout, the capacitor would have to be very small (0.01 µF) or allowances for a greater time to reach operating stability may be required (see Section 5.2 “Power Control Operation” for more information). To determine the best power control configuration for any given application, refer to the data sheets for both the Microchip device and the external device. Figure 5-1: Examples of RTCC Managed Power Control VDD Indirect with Pull-up (PWCPOL = 0) PIC® Microcontroller VDD External Device PWRGT(1) VDD WAKE I/O Direct Supply (PWCPOL = 1) External Device PIC® Microcontroller PWRGT(1) VDD WAKE I/O Note 1: The RTCC output pin may also be used for power control; see text for details. DS70005193A-page 20 2014 Microchip Technology Inc. RTCC with Timestamp 5.1 Initialization To enable power control: • The RTCC must be enabled (RTCEN (RTCCON1L<15>) = 1) • Power control must be enabled (PWCEN (RTCCON1L<10>) = 1) • The PWRGT and/or RTCC pins must be enabled for power control: - For PWRGT, the pin must be enabled (PWCEN (RTCCON1L<10>) = 1) - For RTCC, the pin must be enabled (RTCOE (RTCCON1L<7> = 1) and configured for power control (RTCCON1L<6:4> = 011) In addition, set the CHIME bit (RTCCON1H<14>) to enable the PWC periodicity. The polarity of the PWC control signal on both pins is selected using the PWCPOL bit (RTCCON1L<9>). Active-low or active-high may be used with the appropriate external switch to turn on or off the power to one or more external devices. The active-low setting may also be used in conjunction with an open-drain setting on the PWRGT or RTCC pads, in order to drive the GND or Vss pin(s) of the external device directly (with the appropriate external VDD pull-up device), without the need for external switches. 5.2 Power Control Operation When the RTCC and PWC are enabled and running, the PWC logic generates a control output and a sample gate output. The control output is driven out on either the PRWGT pin or the RTCC pin, and is used to power up or down the external device. Once the control output is asserted, the Stability window begins. During this interval, the external device is given enough time to power-up and provide a stable output. When the output is (theoretically) stable, the Sample window begins. In this interval, the RTCC monitors for the wake-up signal from the external device. Typically, a sample gate is used to mask out one or more wake-up signals from the external device. Finally, both the Stability and Sample windows close after the expiration of the Sample window, and the external device is powered down. 5.2.1 STABILITY AND SAMPLE WINDOWS The Stability and Sample windows are defined in terms of the RTCC clock source, the PWC prescaler, and the PWCSTABx and PWCSAMPx bits field in the RTCCON3L register (RTCCON3L<15:8> and <7:0>, respectively). The clock source selected for the RTCC is also used for the PWC clock source. A dedicated prescaler, controlled by the PWCPS<1:0> bits (RTCCON2L<7:6>), divides the RTCC clock input. Divider options of 1:1, 1:16, 1:64 or 1:256 are available. The clock and prescaler selections determine the base value of the PWC clock period. The 8-bit magnitude of PWCSTABx and PWCSAMPx allows for a Stability/Sample window size of 0 to 255 clock periods. Table 5-1 shows the size of the windows for common RTCC clock and prescaler options. Certain values for PWCSTABx and PWCSAMPx have specific control meanings in determining power control operations. If either field is 00h, the corresponding window is inactive. In addition, if the PWCSTABx field is FFh, the Stability window remains active continuously, even if power control is disabled. Table 5-1: Stability and Sample Windows for Common Clock Sources Clock Source PWCPS<1:0> PWCSTAB<7:0> Range PWCSAMP<7:0> Range SOSC (32.768 kHz) 11 (1:256) 0 ms-2s 0 ms-2s LPRC (31 kHz) 11 (1:256) 0 ms-2.1s 0 ms-2.1s 0 ms-5.12s 0 ms-5.12s 0 ms-4.25s 0 ms-4.25s Power Line (50 Hz) Power Line (60 Hz) 2014 Microchip Technology Inc. 00 (1:1) DS70005193A-page 21 dsPIC33/PIC24 Family Reference Manual 5.2.2 MODES OF OPERATION 220.127.116.11 Normal Operation (Stability and Sample Windows Active) When PWCSTABx is not 0 and PWCSAMPx is any value except 0 or 255, the PWC is configured for the normal mode of operation. In this mode, the external wake-up interrupt should be connected to the external device, controlled by the PWC power enable. Figure 5-2 shows operation with inverted (active-low) operation; Figure 5-3 shows normal (active-high) operation. Figure 5-2: Power Control Timer (Normal Operation, PWCPOL = 0) Alarm Event Stability Window Sample Window RTCC Pin Output Sampling Active Figure 5-3: Power Control Timer (Normal Operation, PWCPOL = 1) Alarm Event Stability Window Sample Window RTCC Pin Output Sampling Active 18.104.22.168 Normal Operation without Stability Delay (Stability Window Inactive) When PWCSTABx is 0 and PWCSAMPx is any value except 0 or 255, the PWC is configured for the normal mode of operation with no stability time, as shown in Figure 5-4. This mode is recommended when the external device, controlled by the PWC power enable, requires no time between when power is applied and when its wake-up or interrupt output is valid. Although a valid option, this case is considered to be unlikely. Figure 5-4: Power Control Timer (Normal Operation without Stability Delay) Alarm Event Sample Window RTCC Pin Output Sampling Active DS70005193A-page 22 2014 Microchip Technology Inc. RTCC with Timestamp 22.214.171.124 Power Control without Sampling (Sample Window Inactive) When PWCSTABx is any value but 0 and PWCSAMPx is 0, the PWC is configured for power control only. No wake-up or interrupt sampling occurs, as shown in Figure 5-5. This mode is generally not used. Figure 5-5: Power Control Timer (Power Control with Inactive Sample Window) Alarm Event Stability Window RTCC Pin Output Sampling Active 126.96.36.199 Power Control without Sampling (Sample Window Unused) When PWCSTABx is any value but 0 and PWCSAMPx is 255, the PWC is configured for power control only. The Sample window, although always active, is not used. This is shown in Figure 5-6. This mode should be used when the external device, controlled by the PWC power enable, does not drive a wake-up or interrupt input directly. In this case, the sampling of external interrupts is disabled and the external interrupt may be driven by any source. Figure 5-6: Power Control Timer (Power Control with Sample Window Unused) Alarm Event Stability Window RTCC Pin Output Sampling Active 188.8.131.52 PWC Disabled When PWCEN is cleared (RTCPWC<15> = 0), the PWCSTABx and PWCSAMPx fields have no effect. In this case, the sampling of external interrupts is disabled; the external interrupt may be driven by any source. 2014 Microchip Technology Inc. DS70005193A-page 23 dsPIC33/PIC24 Family Reference Manual 6.0 TIMESTAMPING The RTCC provides up to two sets of Timestamp registers that are used to capture the Time and Date register values when an external input signal is received. The RTCC has a timestamp event input assigned to each of set of Timestamp registers, Timestamp A and Timestamp B (TSATIMEL/H, TSADATEL/H, etc). Timestamp event sources are device dependent; please see the device data sheet for further details. Because the Timestamp registers are all essentially “blank” 16-bit registers (i.e., all bits are implemented and do not have special Reset conditions), these registers may also be used as backup RAM during Deep Sleep and VBAT modes if the RTCC is configured for VBAT operation. 6.1 Operation Each event input is enabled for timestamping using the TSAEN and TSBEN bits (RTCCON1L<1:0>). If a bit is clear, the event input for the corresponding set of Timestamp registers is disabled. User software may then use the TSxTIMEL/H and TSxDATEL/H register pairs for data storage. When TSxEN = 1, the timestamp source is enabled. When a timestamp event is detected, the present time and date values are stored in the respective TSxTIMEL/H and TSxDATEL/H registers. The TSxEVT status bit becomes set and an RTCC interrupt occurs. The TSxTIMEL/H and TSxDATEL/H registers become read-only when TSxEN = 1. A new timestamp capture event cannot occur until the TSxEVT bit is cleared in software. The edge sensitivity of the timestamp event depends on the source; see the device data sheet for more information. The data stored in TSxTIMEL/H and TSxDATEL/H is maintained throughout all Resets, except for POR and BOR. 6.2 Manual Timestamping The present time and date can be captured in software by writing a ‘1’ to the TSxEVT bit. This does not immediately set the TSxEVT bit, but initiates a timestamp capture. When the capture is completed, the TSxEVT bit becomes set. The application must poll the TSxEVT bit to determine when the capture has completed. After the Timestamp registers have been read, clear the TSxEVT bit to allow further hardware or software timestamp capture events. 7.0 INTERRUPTS The RTCC generates a single, top-level interrupt flag, RTCCIF. This interrupt can be triggered by either a timestamp event (TSA or TSB) or by an RTCC alarm event. Setting the RTCCIE bit allows a device-level interrupt to be generated. If the source of the interrupt is required, the application may poll the appropriate bits in the RTCSTATL register (TSAEVT, TSBEVT or ALMEVT, respectively) to see which event has occurred. DS70005193A-page 24 2014 Microchip Technology Inc. RTCC with Timestamp 8.0 RESETS 8.1 Device Reset When a device Reset, other than POR or BOR occurs, the RTCC will continue to operate if it was already enabled. The Alarm Date and Time registers will need to be reloaded. 8.2 Power-on Reset (POR) The RTCCON registers, and the Time and Date registers are reset on a POR or BOR. Once the device exits the POR state, the time is reset to 12 midnight (00:00:00) on Saturday, January 1st, 2000; the correct time and date will need to be written to these registers. The timer prescaler values can only be reset by writing to the TIMEL register. No device Reset can affect the prescalers. 9.0 OPERATION IN POWER-SAVING MODES 9.1 Idle Mode Idle mode does not affect the operation of the timer or alarm. 9.2 Sleep Modes The timer and alarm continue to operate while in Sleep mode, including Deep Sleep mode. The operation of the alarm is not affected by Sleep, as an alarm event can always wake up the CPU. 9.3 VBAT Mode In devices that include VBAT power-saving features, the RTCC is capable of continued operation during this mode. While the alarm still functions, it will not wake the device. The RTCBAT Configuration bit controls this feature. By default (RTCBAT = 1), continued RTCC operation in VBAT mode is enabled. While in VBAT mode, the RTCC clock source selected by the CLKSEL<1:0> bits remains active. Users should remember to include the incremental current consumption required for the clock source when calculating a power budget for VBAT operation. 10.0 PERIPHERAL MODULE DISABLE (PMD) REGISTER The Peripheral Module Disable (PMD) registers provide a method to disable the RTCC module by stopping all clock sources supplied to that module. When a peripheral is disabled via the appropriate PMD control bit, the peripheral is in a minimum power consumption state. The control and status registers associated with the peripheral will also be disabled, so writes to those registers will have no effect and read values will be invalid. The RTCC will only be enabled if the RTCCMD bit in the PMDx register is cleared. 2014 Microchip Technology Inc. DS70005193A-page 25 REGISTER MAPS A summary of the registers associated with the RTCC with Timestamp module is provided in Table 11-1. Table 11-1: Register RTCC with Timestamp Register Map Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 All Resets RTCCON1L RTCON — — — WRLOCK PWCEN PWCPOL PWCOE RTCOE OUTSEL2 OUTSEL1 OUTSEL0 — — TSBEN TSAEN 0000 RTCCON1H ALRMEN CHIME — — AMASK3 AMASK2 AMASK1 AMASK0 ALMRPT7 ALMRPT6 ALMRPT5 ALMRPT4 ALMRPT3 ALMRPT2 ALMRPT1 ALMRPT0 0000 RTCCON2L FDIV4 FDIV3 FDIV2 FDIV1 FDIV0 — — — PWCPS1 PWCPS0 PS1 PS0 — — CLKSEL1 CLKSEL0 8000 RTCCON2H RTCC Coarse Clock Divider (DIV<15:0>) 3FFF RTCCON3L PWCSAMP7 PWCSAMP6 PWCSAMP5 PWCSAMP4 PWCSAMP3 PWCSAMP2 PWCSAMP1 PWCSAMP0 PWCSTAB7 PWCSTAB6 PWCSTAB5 PWCSATB4 PWCSTAB3 PWCSTB2 PWCSTAB1 PWCSTAB0 0000 RTCSTATL — — — — — — — — CPLK — ALMEVT TSBEVT TSAEVT SYNC ALMSYNC HALFSEC 0000 RTCSTATH — — — — — — — — — — — — — — — — 0000 TIMEL — SECTEN2 SECTEN1 SECTEN0 SECONE3 SECONE2 SECONE1 SECONE0 — — — — — — — — 0000 TIMEH — — HRTEN1 HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0 — MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0 0000 DATEL — — DAYTEN1 DAYTEN0 DAYONE3 DAYONE2 DAYONE1 DAYONE0 — — — — — WDAY2 WDAY1 WDAY0 0106 DATEH YRTEN3 YRTEN2 YRTEN1 YRTEN0 YRONE3 YRONE2 YRONE1 YRONE0 — — — MTHTEN MTHONE0 0001 ALMTIMEL — SECTEN2 SECTEN1 SECTEN0 SECONE3 SECONE2 SECONE1 SECONE0 — — — — — — — — 0000 ALMTIMEH — — HRTEN1 HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0 — MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0 0000 ALMDATEL — — DAYTEN1 DAYTEN0 DAYONE3 DAYONE2 DAYONE1 DAYONE0 — — — — — WDAY2 WDAY1 WDAY0 0106 ALMDATEH YRTEN3 YRTEN2 YRTEN1 YRTEN0 YRONE3 YRONE2 YRONE1 YRONE0 — — — MTHTEN MTHONE0 0001 MTHONE3 MTHONE2 MTHONE1 MTHONE3 MTHONE2 MTHONE1 TSATIMEL Timestamp A Time Register Low (TSATIMEL<15:0>) 0000 TSATIMEH Timestamp A Time Register High (TSATIMEH<15:0>) 0000 TSADATEL Timestamp A Date Register Low (TSADATEL<15:0>) 0000 TSADATEH Timestamp A Date Register High (TSADATEH<15:0>) 0000 TSBTIMEL Timestamp B Time Register Low (TSBTIMEL<15:0>) 0000 TSBTIMEH Timestamp B Time Register High (TSBTIMEH<15:0>) 0000 TSBDATEL Timestamp B Date Register Low (TSBDATEL<15:0>) 0000 TSBDATEH Timestamp B Date Register High (TSBDATEH<15:0>) 0000 Legend: — = unimplemented, read as ‘0’. Reset values are shown in hexadecimal. 2014 Microchip Technology Inc. dsPIC33/PIC24 Family Reference Manual DS70005193A-page 26 11.0 RTCC with Timestamp 12.0 RELATED APPLICATION NOTES This section lists application notes that are related to this section of the manual. These application notes may not be written specifically for the dsPIC33 or PIC24 device families, but the concepts are pertinent and could be used with modification and possible limitations. The current application notes related to the RTCC with Timestamp module are: Title Application Note # No related application notes at this time. 2014 Microchip Technology Inc. DS70005193A-page 27 dsPIC33/PIC24 Family Reference Manual 13.0 REVISION HISTORY Revision A (October 2014) This is the initial released revision of this document. DS70005193A-page 28 2014 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, dsPIC, FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck, MediaLB, MOST, MOST logo, MPLAB, OptoLyzer, PIC, PICSTART, PIC32 logo, RightTouch, SpyNIC, SST, SST Logo, SuperFlash and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. The Embedded Control Solutions Company and mTouch are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet, KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, RightTouch logo, REAL ICE, SQI, Serial Quad I/O, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. GestIC is a registered trademarks of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2014, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. ISBN: 978-1-63276-737-0 QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV == ISO/TS 16949 == 2014 Microchip Technology Inc. Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. 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