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PCF8593P Datasheet(PDF) 5 Page - NXP Semiconductors |
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PCF8593P Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 28 page  1997 Mar 25 5 Philips Semiconductors Product specification Low power clock/calendar PCF8593 7 FUNCTIONAL DESCRIPTION The PCF8593 contains sixteen 8-bit registers with an 8-bit auto-incrementing address register, an on-chip 32.768 kHz oscillator circuit, a frequency divider and a serial two-line bidirectional I2C-bus interface. The first 8 registers (memory addresses 00 to 07) are designed as addressable 8-bit parallel registers. The first register (memory address 00) is used as a control/status register. The memory addresses 01 to 07 are used as counters for the clock function. The memory addresses 08 to 0F may be programmed as alarm registers or used as free RAM locations. 7.1 Counter function modes When the control/status register is programmed, a 32.768 kHz clock mode, a 50 Hz clock mode or an event-counter mode can be selected. In the clock modes the hundredths of a second, seconds, minutes, hours, date, month (four year calendar) and weekday are stored in a BCD format. The timer register stores up to 99 days. The event counter mode is used to count pulses applied to the oscillator input (OSCO left open-circuit). The event counter stores up to 6 digits of data. When one of the counters is read (memory locations 01 to 07), the contents of all counters are strobed into capture latches at the beginning of a read cycle. Therefore, faulty reading of the count during a carry condition is prevented. When a counter is written, other counters are not affected. 7.2 Alarm function modes By setting the alarm enable bit of the control/status register the alarm control register (address 08) is activated. By setting the alarm control register a dated alarm, a daily alarm, a weekday alarm or a timer alarm may be programmed. In the clock modes, the timer register (address 07) may be programmed to count hundredths of a second, seconds, minutes, hours or days. Days are counted when an alarm is not programmed. Whenever an alarm event occurs the alarm flag of the control/status register is set. A timer alarm event will set the alarm flag and an overflow condition of the timer will set the timer flag. The open-drain interrupt output is switched on (active LOW) when the alarm or timer flag is set (enabled). The flags remain set until directly reset by a write operation. When the alarm is disabled (Bit 2 of control/status register = 0) the alarm registers at addresses 08 to 0F may be used as free RAM. 7.3 Control/status register The control/status register is defined as the memory location 00 with free access for reading and writing via the I2C-bus. All functions and options are controlled by the contents of the control/status register (see Fig.3). 7.4 Counter registers In the clock modes 24 h or 12 h format can be selected by setting the most significant bit of the hours counter register. The format of the hours counter is shown in Fig.5. The year and date are packed into memory location 05 (see Fig 6). The weekdays and months are packed into memory location 06 (see Fig.7). When reading these memory locations the year and weekdays are masked out when the mask flag of the control/status register is set. This allows the user to read the date and month count directly. In the event-counter mode events are stored in BCD format. D5 is the most significant and D0 the least significant digit. The divider is by-passed. In the different modes the counter registers are programmed and arranged as shown in Fig.4. Counter cycles are listed in Table 1. |
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