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PT7C4337AWE Datasheet(PDF) 8 Page - Pericom Semiconductor Corporation |
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PT7C4337AWE Datasheet(HTML) 8 Page - Pericom Semiconductor Corporation |
8 / 25 page ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2014-10-0002 PT0480-2 11/03/14 8 PT7C4337A/4337AC Real-time Clock Module (I 2C Bus) Function Description Overview of Functions Clock function CPU can read or write data including the year (last two digits), month, date, day, hour, minute, and second. Any (two-digit) year that is a multiple of 4 is treated as a leap year and calculated automatically as such until the year 2100. On a power-on reset (POR), the time and date are set to 00:00:00 01/01/00 (hh:mm:ss DD/MM/YY) and the Day register is set to 01. Alarm function This device has two alarm system (Alarm 1 and Alarm 2) that outputs interrupt signals from INTA or INTB to CPU when the date, day of the week, hour, minute or second correspond to the setting. Each of them may output interrupt signal separately at a specified time. The alarm is be selectable between on and off for matching alarm or repeating alarm. Programmable square wave output A square wave output enable bit controls square wave output at pin 7. Frequencies are selectable: 1, 4.096k, 8.192k, 32.768k Hz. Interface with CPU Data is read and written via the I 2C bus interface using two signal lines: SCL (clock) and SDA (data). Since the output of the I/O pin SDA is open drain, a pull-up resistor should be used on the circuit board if the CPU output I/O is also open drain. The SCL's maximum clock frequency is 400 kHz, which supports the I 2C bus's high-speed mode. Oscillator fail detect When oscillator fail, PT7C4337A OSF bit will be set. Oscillator enable/disable Oscillator and time count chain can be enabled or disabled at the same time by /ETIME bit. Registers Allocation of registers Addr. (hex) *1 Function Register definition Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00 Seconds (00-59) 0 S40 S20 S10 S8 S4 S2 S1 01 Minutes (00-59) 0 M40 M20 M10 M8 M4 M2 M1 02 Hours (00-23 / 01-12) 0 12, /24 H20 or P, /A H10 H8 H4 H2 H1 03 Days of the week (01-07) 0 0 0 0 0 W4 W2 W1 04 Dates (01-31) 0 0 D20 D10 D8 D4 D2 D1 05 Months (01-12) Century 0 0 MO10 MO8 MO4 MO2 MO1 06 Years (00-99) Y80 Y40 Y20 Y10 Y8 Y4 Y2 Y1 07 Alarm 1: Seconds A1M1 *2 S40 S20 S10 S8 S4 S2 S1 |
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