Epson RTC-72421 B manuals
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25 pages 209.1 Kb
2 In pursuit of "Saving" Technology ,Epson electronic device"Saving Epson IS energy savings •The material is subject to change without notice 3 (AC characteristics)When ALE is used When ALE is fixed at VDD Notes Timing registers CD register (control register D) CF register (control register F) Power-onprocedure (initialization) Read/write of S1 to W registers Write to 30-secondADJ bit Using the CS1 pin Notes on handling Notes on packaging 4 Built-in•Microprocessor bus compatible ( tWW, tRD = 120 ns ) •Use of C-MOSIC enables low current consumption ( 5 ∝ A Max., at VDD = 2.0 V ) •Compatibility with Intel CPU bus •Address latch enable (ALE) pin compatible with multiplex bus CPUs •Time (hours, minutes, seconds) and calendar (year, month, day) counter •24-hour/12-hourswitchover and automatic leap-yearcorrection functions •Fixed-periodinterrupt function •30-secondscorrection (adjustment) function •Stop, start, and reset functions •Battery back-upfunction •Same mounting conditions as general-purposeSMD ICs possible (RTC-72423) ∗Pins and functions compatible with the SMC-5242series Page MQ - 162 5 RTC-72421RTC-72423 6 SignalPin No Input/ou tput D0-D3 11− 14− 16 Bi 5, 7, 9 Input ALE (WRite) (ReaD) CS1 15,2 20,2 (Chip Select) Output (STanDard Pulse) GND 16 22,23 N.C 7 1. Absolute maximum ratingsSpecification 2. Recommended operating conditions 3. Frequency characteristics and current consumption characteristics 4. Electrical characteristics ( DC characteristics ) Applicable pins Min Typ Max 8 1. When ALE is used9 2. When ALE is fixed at VDD10 1. Register table2. Notes 3. Functions of register bits (overview) 11 4. Setting the fixed-periodpulse output mode and fixed-periodinterrupt mode5. Resetting the fixed-periodpulse output mode and fixed-periodinterrupt mode 12 1. Timing registers(1) S1 to Y10 registers (2) W register Count Day Sunday Monday Friday (3) H10 register (PM/AM, h20, h10) If the 24-hourclock is selected, the PM/AM bit will always be (4) Y1 and Y10 registers [ Leap years ] [ Leap years in the RTC-72421/72423] (5) Out-of-rangedata 13 2. CD register (control register D)(1) HOLD bit (D0) (2) BUSY bit (D1) (3) IRQ FLAG bit (D2) i. Interrupt processing (interrupt status monitor function) *STD.P pin output IRQ FLAG bit Approx. 1.95 ms 7.8125 ms The output levels of the STD.P pin are low (down) and open circuit (up) ii. STD.P pin output reset function 14 *STD.P pin outputIRQ FLAG bit iii. Initial setting of IRQ FLAG bit (4) 30-secondADJ bit (D3) i. Operation of 30-secondsADJ bit ii. Access inhibited after 30-secondscorrection 3. CE register (control register E) (1) MASK bit (D0) MASK ITRPT/STND STD.P pin output Fixed-periodinterrupt mode 0 or Open 1.Fixed-periodpulse output mode (ITRPT/STND=0) The output levels of the STD.P pin are low (down) and open circuit(up) 15 i. Setting t0 and t1ii. STD.P pin output control (ITRPT/STND=0) (ITRPT/STND=1) iii. Frequency of STD.P pin output in fixed-periodpulse output mode 16 4. CF register (control register F)i. Switching between 12-hourclock and 24-hourclock ii.Overwriting the 24/12 bit 17 Power OnTo next process 18 (A)Starting the count(B)Checking the status of the BUSY bit (C)Stopping and resetting the counter 19 2. Read/write of S1 to W registers3. Write to 30-secondADJ bit 20 4. Using the CS1 pin(1) Functions •Protecting internal data during standby Make sure that the voltage input to the CS (2) Timing Do not access the RTC while the voltage at CS1 is changing (3) Note Note1 Note2 VDD Voltage RTC detection CS1 circuit Ceramic capacitor of 0.01 ∝ F to 0.1 ∝ F GND 21 1. Connection to multiplexed bus type2. Connection to Z80 or compatible CPU 3. Connection to 68-seriesMPU 22 1.RTC-724212.RTC-72423 23 ∆ fTθ T ∆ fV Frequency[x10-6] Supply Voltage(VDD) [V] Current consumption[∝ A] Conditions Supply voltage(VDD) 24 1. Notes on handling(1) Static electricity (2) Noise (3)Voltage levels of input pins (4) Handling of unused pins 2. Notes on packaging (1) Soldering heat resistance (2)Mounting equipment (3) Ultrasonic cleaning (4) Mounting orientation (5) Leakage between pins 25 DistributorAMERICA EPSON ELECTRONICS AMERICA, INC HEADQUARTER 150 River Oaks Parkway, San Jose, CA 95134, U.S.A http://www.eea.epson.com Atlanta Office 3010 Royal Blvd. South, Ste. 170, Alpharetta, GA 30005, U.S.A Boston Office Chicago Office 101 Virginia St., Ste. 290, Crystal Lake, IL 60014, U.S.A El Segundo Office 1960 E. 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