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CDP1879CE1 Datasheet(PDF) 3 Page - Intersil Corporation |
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CDP1879CE1 Datasheet(HTML) 3 Page - Intersil Corporation |
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3 / 18 page  4-106 RESET AM - PM AND HOUR LOGIC PRESCALE OSCILLATOR SECOND XTAL XTAL MINUTE HOUR DAY MONTH FREEZE CIRCUIT CALENDAR LOGIC PRESCALE SELECT CLOCK SELECT CONTROL REGISTER INT. STATUS REGISTER CLOCK AND INT. LOGIC CLOCK OUT INT VDD VSS I/O INTERFACE SECOND LATCH MINUTE LATCH HOUR LATCH COMPARATOR DB0-DB7 A0 A1 A2 TPA I-O MEM TPB/WR RD CS POWER DOWN ADDRESS DECODE AND CONTROL LOGIC 8-BIT DATA BUS FIGURE 1. REAL-TIME CLOCK FUNCTIONAL DIAGRAM TABLE 1. CONTROL REGISTER BIT ASSIGNMENT Bit 1, 0 Frequency 00 Select 01 10 11 32768Hz 1.048576MHz 2.097152MHz 4.194304MHz Bit 2 Start/Stop 1 = Start 0 = Stop Bit 3 Counter/Latch Control “0” = Write to Counter and disable alarm “1” = Write to and enable alarm Clock Select Bit 7, 6, 5, 4 0000 - disable µs 0001 - 488.2 µs 0010 - 976.5 µs 0011 - 1953.1 µs 0100 - 3906.2 µs 0101 - 7812.5 µs 0110 - 15.625ms 0111 - 31.25ms 1000 - 62.5ms 1001 - 125ms 1010 - 250ms 1011 - 500ms 1100 - sec. 1101 - min. 1110 - hour 1111 - day TABLE 2. ADDRESSES A2 A1 A0 Latch, Counter Seconds 0 1 0 Latch, Counter Minutes 0 1 1 Latch, Counter Hours 1 0 0 Counter, Day 1 0 1 Counter, Month 1 1 0 Control, Register 1 1 1 Status Register 1 1 1 MSB of Hours Counters (Bit 7) is an AM-PM Bit. 0 = AM; 1 = PM Bit 6 of Hours Counter Controls 12/24 hr. 1 = 12 Hr: 0 = 24 Hr. Status Register: Bit 7 MSB = Alarm Interrupt Source: Bit 6 = Clock. MSB of Month Counter (Bit 7) is a Leap Year Bit 0 = No, 1 = Yes. CDP1879, CDP1879C-1 |
Número de pieza similar - CDP1879CE1 |
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Descripción similar - CDP1879CE1 |
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