SuperH (SH) 64-Bit RISC Series SH-5 System Architecture, Volume ...

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PRELIMINARY DATA166 Operation7.3 OperationExamples of the use of the RTC are shown below.7.3.1 Time setting proceduresFigure 15 shows examples of the time setting procedures.YesStop clockReset frequency dividerSet second/minute/hour/day/day-of-week/month/yearStart clock operation(a) Setting time after stopping clockClear carry flagWrite to counter registerCarry flag = 1?NoSet RCR2.RESET to 1Clear RCR2.START to 0In any orderSet RCR2.START to 1(b) Setting time while clock is runningClear RCR1.CF to 0(Write 1 to RCR1.AF so that alarm flagis not cleared)Set RYRCNT first and RSECCNT lastRead RC register and check CF bitFigure 15: Examples of time setting proceduresD R A FTThe procedure for setting the time after stopping the clock is shown in (a). Theprogramming for this method is simple, and it is useful for setting all the counters,from second to year.The procedure for setting the time while the clock is running is shown in (b). Thismethod is useful for modifying only certain counter values (for example, only thesecond data or hour data). If a carry occurs during the write operation, the writedata is automatically updated and there will be an error in the set data. The carrySuperH, Inc.SH-5 System Architecture, Volume 1: System 05-SA-10001 v1.0
PRELIMINARY DATAOperation 167flag should therefore be used to check the write status. If the carry flag(RTC.RCR1.CF) is set to 1, the write must be repeated.The interrupt function can also be used to determine the carry flag status.7.3.2 Time reading proceduresFigure 16 shows examples of the time reading procedures.YesYesDisable carry interruptsClear carry flagRead counter registerCarry flag = 1?NoClear RCR1.CIE to 0Clear RCR1.CF to 0(Write 1 to RCR1.AF so that alarm flagis not cleared)Set RCR2.START to 1(a) Reading time without using interruptsClear carry flagEnable carry interruptsClear carry flagRead counter registerD R A FTInterrupt generated?NoDisable carry interruptsRead RCR1 register and check CF bitSet RCR1.CIE to 1Clear RCR1.CF to 0(Write 1 to RCR1.AF so that alarm flagis not cleared)Clear RCR1.CIE to 0(b) Reading time using interruptsFigure 16: Examples of time reading procedures05-SA-10001 v1.0SuperH, Inc.SH-5 System Architecture, Volume 1: System
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PRELIMINARY DATASuperH TM (SH)64-Bi
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PRELIMINARY DATAContentsPrefacexi1
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PRELIMINARY DATAv3 SH-5 CPU 533.1 I
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PRELIMINARY DATAvii6.2 Interrupt so
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PRELIMINARY DATAix8.5 Usage notes 1
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PRELIMINARY DATAxi10.6 Reset contro
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PRELIMINARY DATAPrefaceThis documen
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PRELIMINARY DATAOverview1.1 Introdu
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PRELIMINARY DATAIntroduction 3DM_CL
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PRELIMINARY DATADebug architecture
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PRELIMINARY DATADebug architecture
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PRELIMINARY DATASystemorganization2
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PRELIMINARY DATASuperHyway architec
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PRELIMINARY DATACache coherency sup
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PRELIMINARY DATAOther features 212.
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PRELIMINARY DATASH-5 SuperHyway imp
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PRELIMINARY DATASH-5 SuperHyway imp
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PRELIMINARY DATASH-5 physical addre
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PRELIMINARY DATASH-5 conventions 29
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PRELIMINARY DATASH-5 endianess and
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PRELIMINARY DATASH-5 CPU3.1 Introdu
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PRELIMINARY DATAMemory mapped regis
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PRELIMINARY DATAMemory mapped regis
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PRELIMINARY DATADMAcontrollerD R A
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PRELIMINARY DATAOperation 654.3 Ope
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PRELIMINARY DATAOperation 67In the
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PRELIMINARY DATAOperation 69On-Chip
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PRELIMINARY DATAOperation 71Before
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PRELIMINARY DATARegister descriptio
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PRELIMINARY DATADMAC SuperHyway tra
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PRELIMINARY DATAPeripheralbridge5.1
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PRELIMINARY DATAFunctionality 955.2
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PRELIMINARY DATAOperation 975.3.3 P
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PRELIMINARY DATAOperation 99Ports 5
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PRELIMINARY DATAOperation 101PERIPH
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PRELIMINARY DATAOperation 103The se
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PRELIMINARY DATAOperation 105PERIPH
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PRELIMINARY DATAInterruptcontroller
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PRELIMINARY DATAFeatures 1096.1.2 P
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PRELIMINARY DATAInterrupt sources 1
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PRELIMINARY DATAInterrupt sources 1
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PRELIMINARY DATAOperation 241Bit 0
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PRELIMINARY DATAOperation 243SCIF.S
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PRELIMINARY DATAOperation 245ClockE
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PRELIMINARY DATAOperation 247Serial
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PRELIMINARY DATAOperation 2491Seria
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PRELIMINARY DATAOperation 251NoNoNo
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PRELIMINARY DATAOperation 2531Seria
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PRELIMINARY DATAPower down 255Inter
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PRELIMINARY DATAUsage notes 257Send
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PRELIMINARY DATAClock, powerand res
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PRELIMINARY DATAClock pulse generat
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PRELIMINARY DATAWatchdog timer 2791
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PRELIMINARY DATAWatchdog timer 281C
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PRELIMINARY DATAWatchdog timer 283C
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PRELIMINARY DATAWatchdog timer 285N
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PRELIMINARY DATAPower management un
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PRELIMINARY DATADebug and power man
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PRELIMINARY DATADebug and power man
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PRELIMINARY DATAReset controller 31
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PRELIMINARY DATAIndexAAddress 1-2,
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PRELIMINARY DATA325Endian 43, 58Bi-
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PRELIMINARY DATA327Physical memory
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PRELIMINARY DATA329StoreWord 30, 61
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