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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCF8564AUG датащи(PDF) 15 Page - NXP Semiconductors |
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PCF8564AUG датащи(HTML) 15 Page - NXP Semiconductors |
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15 / 48 page  PCF8564A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 3 — 26 August 2013 15 of 48 NXP Semiconductors PCF8564A Real time clock and calendar The generation of interrupts from the alarm function is controlled via bit AIE. If bit AIE is enabled, the INT pin follows the condition of bit AF. AF will remain set until cleared by command. Once AF has been cleared, it will only be set again when the time increments to match the alarm condition once more. Alarm registers which have their AEN_x bit at logic 1 are ignored. 8.7 Register CLKOUT_ctrl and clock output A programmable square wave is available at pin CLKOUT. Operation is controlled by the FE bit in register CLKOUT_ctrl at address 0Dh and the CLKOUT output enable pin (CLKOE). To enable pin CLKOUT pin CLKOE must be set HIGH. Frequencies of 32.768 kHz (default), 1.024 kHz, 32 Hz, and 1 Hz can be generated for use as a system clock, microcontroller clock, input to a charge pump, or for calibration of the oscillator. (1) Only when all enabled alarm settings are matching. It’s only on increment to a matched case that the alarm flag is set, see Section 8.6.5. Fig 7. Alarm function block diagram |
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