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RTC62421 Datasheet(PDF) 2 Page - Epson Company |
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RTC62421 Datasheet(HTML) 2 Page - Epson Company |
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2 / 2 page  64 Real time clock module CS1 CS0 or WR not occurred CS1 1/5VDD VDD 4V 4V VIH2 VIH2 VIL2 VIL2 tCDR tR 2 to 4V ≤ Data storage mode Interface possible with external terminals Interface possible with external terminals Data holding timing Register table 32.768 kHz WR RD D3 D2 D1 D0 A3 A2 A1 A0 CS0 ALE CS1 OCS G A T E G A T E G A T E & L A T C H D E C O D E R SI to CF COUNTER 1 Hz RESET bit STOP bit HOLD bit BUSY bit 64Hz STD.P 1 sec carry 1 minute carry 1 hour carry 30s.ADJ bit 30s.ADJ bit 24 / 12 bit S1 S10 D1 D10 M10 H1 H10 Y1 Y10 W M1 MO10 MO1 CD CE CF VDD Switching characteristics Read mode Write mode VIH2 VIH2 VIH1 VIH1 VIH1 VIH1 VIL1 VIL1 VIL1 VIL1 VIH1 VIH1 VIH1 VIH1 VIL1 VIH1 VIL1 CS0 ALE WR A3 to A0 D3 to D0 (Input ) t C1H t CIS t AS t RCV t AH t AW t WAL t ALW tWW tDS tDH CS1 VIH2 VIH2 VIH1 VIL1 VIH1 VIL1 VIL1 VIH1 VIH1 VOH VOL VIH1 VIH1 VIL1 CS0 ALE RD A3 to A0 D3 to D0 (output ) t CIH t C1S t AS t RCV t RD t DR t AH t ALR CS1 “Z” Block diagram Supplement 0=“L” level. 1=“H” level Note: Do not enter erroneous data for clock. This may result in time keeping error. ( VDD = 5V ± 0.5V, Ta = -40 to + 85˚C) ( ALE = While in use) t AW t RAL 0 1 2 3 4 5 6 7 8 9 A B C D E F A3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 A2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 A1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 A0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Name of register S1 S10 MI1 MI10 H1 H10 D1 D10 MO1 MO10 Y1 Y10 W CD CE CF D3 s8 ∗ mi8 ∗ h8 ∗ d8 mo8 y8 y80 ∗ 30 sec. ADJ t 1 TEST D2 s4 s40 mi4 mi40 h4 PM/AM d4 mo4 ∗ y4 y40 w4 IRQ FLAG t 0 24/12 D1 s2 s20 mi2 mi20 h2 h20 d2 d20 mo2 y2 y20 w2 BUSY ITRPT /STND STOP D0 s1 s10 mi1 mi10 h1 H10 d1 d10 mo1 mo10 y1 y10 w1 HOLD MASK RESET Count 0 to 9 0 to 5 0 to 9 0 to 5 0 to 9 0 to 2 or 0 to 1 0 to 9 0 to 3 0 to 9 0 to 1 0 to 9 0 to 6 Note 1 - sec. digit register 10 - sec. digit register 1 - min. digit register 10 - min. digit register 1 - hour digit register 10 - hour digit register 1 - day digit register 10 - day digit register 1 - month digit register 10 - month digit register 1 - year digit register 10 - year digit register Week register Control register D Control register E Control register F 1 0 PM/AM PM AM 24/12 24 12 ITRPT/STND ITRPT STND Bit name ∗ mark BUSY IRQ FLAG 24H/12H TEST Description Writable. Recognized as 0 while in read mode. Read only (effective only when HOLD=1) Enter “0” only when clearing interruption. Enter “1” otherwise. Set able only when RESET=1 For our company's testing. TEST should be “0” in normal use. Item CS1 setup time CS1 hold time Address setup time Address hold time ALE pulse width ALE before WRITE ALE before READ ALE after WRITE ALE after READ WRITE pulse width RD __ to data DATA hold DATA setup time DATA hold time RD __ /WR ___ recovery time Symbol tCIS tCIH tAS tAH tAW tALW tALR tWAL tRAL tWW tRD tDR tDS tDH tRCV Condition — CL=150pF — Min. 1000 1000 25 25 40 10 10 20 10 120 0 100 10 60 Max. — 120 45 — Unit ns ∗ |
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Similar Description - RTC62421 |
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