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PCF8563 Datasheet(PDF) 4 Page - NXP Semiconductors |
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PCF8563 Datasheet(HTML) 4 Page - NXP Semiconductors |
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4 / 32 page  PCF8563_6 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 06 — 21 February 2008 4 of 32 NXP Semiconductors PCF8563 Real-time clock/calendar 6.2 Pin description 7. Functional description The PCF8563 contains sixteen 8-bit registers with an auto-incrementing address register, an on-chip 32.768 kHz oscillator with one integrated capacitor, a frequency divider which provides the source clock for the Real-Time Clock/calender (RTC), a programmable clock output, a timer, an alarm, a voltage-low detector and a 400 kHz I2C-bus interface. All 16 registers are designed as addressable 8-bit parallel registers although not all bits are implemented. The first two registers (memory address 00h and 01h) are used as control and/or status registers. The memory addresses 02h through 08h are used as counters for the clock function (seconds up to years counters). Address locations 09h through 0Ch contain alarm registers which define the conditions for an alarm. Address 0Dh controls the CLKOUT output frequency. 0Eh and 0Fh are the timer control and timer registers, respectively. The seconds, minutes, hours, days, weekdays, months, years as well as the minute alarm, hour alarm, day alarm and weekday alarm registers are all coded in Binary Coded Decimal (BCD) format. When one of the RTC registers is read the contents of all counters are frozen. Therefore, faulty reading of the clock/calendar during a carry condition is prevented. 7.1 Alarm function modes By clearing the MSB of one or more of the alarm registers (bit AE = Alarm Enable), the corresponding alarm condition(s) will be active. In this way an alarm can be generated from once per minute up to once per week. The alarm condition sets the Alarm Flag (AF). The asserted AF can be used to generate an interrupt (on pin INT). The AF can only be cleared by software. Table 2. Pin description Symbol Pin Description DIP8, SO8, TSSOP8 HVSON10 OSCI 1 1 oscillator input OSCO 2 2 oscillator output n.c. - 3 not connected INT 3 4 interrupt output (open-drain; active LOW) VSS 4 5 ground SDA 5 6 serial data input and output SCL 6 7 serial clock input CLKOUT 7 8 clock output, open-drain VDD 8 9 positive supply voltage n.c. - 10 not connected |
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