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PT7C4337ACZSAE Datasheet(PDF) 9 Page - Pericom Semiconductor Corporation |
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PT7C4337ACZSAE Datasheet(HTML) 9 Page - Pericom Semiconductor Corporation |
9 / 25 page ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2014-10-0002 PT0480-2 11/03/14 9 PT7C4337A/4337AC Real-time Clock Module (I 2C Bus) 08 Alarm 1: Minutes A1M2 *2 M40 M20 M10 M8 M4 M2 M1 09 Alarm 1: Hours A1M3 *2 12, /24 H20 or P, /A H10 H8 H4 H2 H1 0A Alarm 1: Day, Date A1M4 *2 Day, /Date 0, D20 0, D10 0, D8 W4, D4 W2, D2 W1, D1 0B Alarm 2: Minutes A2M2 *3 M40 M20 M10 M8 M4 M2 M1 0C Alarm 2: Hours A2M3 *3 12, /24 H20 or P, /A H10 H8 H4 H2 H1 0D Alarm 2: Day, Date A2M4 *3 Day, /Date 0, D20 0, D10 0, D8 W4, D4 W2, D2 W1, D1 0E Control /ETIME *4 0 0 RS2 *5 RS1 *5 INTCN *6 A2IE *7 A1IE *7 0F Status OSF *9 0 0 0 0 0 A2F *8 A1F *8 Caution points: *1. PT7C4337A uses 8 bits for address. For excess 0FH address, PT7C4337A will not respond (no acknowledge signal was given). *2. Alarm 1 mask bits. Select alarm repeated rate when an alarm occurs. *3. Alarm 2 mask bits. Select alarm repeated rate when an alarm occurs. *4. Oscillator and time count chain enable/disable bit. *5. Square wave output frequency select. *6. Interrupt output pin select bit. *7. Alarm 1 and alarm 2 enable bits. *8. Alarm 1 and alarm 2 flag bits. *9. Oscillator stops flag. *10. All bits marked with "0" are read-only bits. Their value when read is always "0". Control and status register Addr. (hex) Description D7 D6 D5 D4 D3 D2 D1 D0 0E Control /ETIME 0 0 RS2 RS1 INTCN A2IE A1IE (default) 0 0 0 1 1 0 0 0 0F Status OSF 0 0 0 0 0 A2F A1F (default) 1 0 0 0 0 0 Undefined Undefined Oscillator related bits /ETIME Enable oscillator and time count chain bit. /ETIME Data Description Read / Write 0 Enable oscillator and time count chain. Default 1 Disable oscillator and time count chain. OSF Oscillator Stops Flag. A logic 1 in this bit indicates that the oscillator either is stopped or was stopped for some period of time and may be used to judge the validity of the clock and calendar data. This bit is set to logic 1 anytime that the oscillator stops. The following are examples of conditions that can cause the OSF bit to be set: 1) The first time power is applied. 2) The voltage present on VCC is insufficient to support oscillation. 3) The /ETIME bit is turned off. 4) External influences on the crystal (e.g., noise, leakage, etc.). This bit remains at logic 1 until written to logic 0. |
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