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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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MM58174 Scheda tecnica(PDF) 4 Page - National Semiconductor (TI) |
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MM58174 Scheda tecnica(HTML) 4 Page - National Semiconductor (TI) |
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4 / 8 page  Circuit Description (Continued) TLF6681 – 3 FIGURE 2 Crystal Oscillator DAYS COUNTER There are two Days counters a) units of days b) tens of days The Days counters will count up to 28 29 30 or 31 days depending on the state of the Months counters and the Years Status Register Days counters have parallel load and read multiplex capabilities MONTHS COUNTERS There are two Months counters a) units of months b) tens of months The Months counters have parallel load and read multiplex capabilities YEARS STATUS REGISTER The Years Status register is a shift register of 4 bits It will be shifted every year on December 31st The status register must be set in accordance with Table III No readout capa- bility is provided CHIP SELECT (CS) An external chip select is provided The chip enable is ac- tive low COUNTER AND REGISTER SELECTION Table I shows the coding on the address lines AD0 – AD3 which select the registers in the circuit to be either parallel loaded or read on to the output bus TLF6681 – 4 FIGURE 3 Test Mode Organization STARTSTOP (RESET) LATCH A logic ‘‘1’’ on DB0 at chip address 14 (E) will start the clock running a logic ‘‘0’’ will stop the clock This function allows the loading of time data into the clock and its precise start- ing The clock starts at 01 seconds TEST MODE This mode is incorporated to facilitate production testing of the circuit In this mode the 32768 Hz clock is fed forward as shown in Figure 3 For normal operation the circuit must be set to the non-test mode as part of the system initializa- tion This is accomplished by writing a logic ‘‘0’’ to DB3 at AD0 TABLE I Address Decoding for Internal Registers Selected Counter Address Bits Mode AD3 AD2 AD1 AD0 0 Test Only 0 0 0 0 Write Only 1 Tenths of Secs 0 0 0 1 Read Only 2 Units of Secs 0 0 1 0 Read Only 3 Tens of Secs 0 0 1 1 Read Only 4 Units of Mins 0 1 0 0 Read or Write 5 Tens of Mins 0 1 0 1 Read or Write 6 Units of Hours 0 1 1 0 Read or Write 7 Tens of Hours 0 1 1 1 Read or Write 8 Units of Days 1 0 0 0 Read or Write 9 Tens of Days 1 0 0 1 Read or Write 10 Day of Week 1 0 1 0 Read or Write 11 Units of Months 1 0 1 1 Read or Write 12 Tens of Months 1 1 0 0 Read or Write 13 Years 1 1 0 1 Write Only 14 StopStart 1 1 1 0 Write Only 15 Interrupt 1 1 1 1 Read or Write 4 |
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