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PCF8563T Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCF8563T Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 30 page Philips Semiconductors PCF8563 Real-time clock/calendar Product specification 16 April 1999 7 of 30 9397 750 04855 © Philips Electronics N.V. 1999. All rights reserved. 8.6.2 Control/Status 2 register [1] TF and INT become active simultaneously. [2] n = loaded countdown timer value. Timer stopped when n = 0. Table 7: Description of Control/Status 2 register bits description (address 01H) Bit Symbol Description 7 to 5 0 By default set to logic 0. 4 TI/TP TI/TP = 0: INT is active when TF is active (subject to the status of TIE). TI/TP = 1: INT pulses active according to Table 8 (subject to the status of TIE). Note that if AF and AIE are active then INT will be permanently active. 3 AF When an alarm occurs, AF is set to logic 1. Similarly, at the end of a timer countdown, TF is set to logic 1. These bits maintain their value until overwritten by software. If both timer and alarm interrupts are required in the application, the source of the interrupt can be determined by reading these bits. To prevent one flag being overwritten while clearing another, a logic AND is performed during a write access. See Table 9 for the value descriptions of bits AF and TF. 2TF 1 AIE Bits AIE and TIE activate or deactivate the generation of an interrupt when AF or TF is asserted, respectively. The interrupt is the logical OR of these two conditions when both AIE and TIE are set. AIE = 0: alarm interrupt disabled; AIE = 1: alarm interrupt enabled. TIE = 0: timer interrupt disabled; TIE = 1: timer interrupt enabled. 0 TIE Table 8: INT operation (bit TI/TP = 1) Source clock (Hz) INT [1] period (s) n [2] =1 n>1 4 096 1 ⁄8192 1 ⁄4096 64 1 ⁄128 1 ⁄64 1 1 ⁄64 1 ⁄64 1 ⁄60 1 ⁄64 1 ⁄64 Table 9: Value descriptions for bits AF and TF R/W Bit: AF Bit: TF Value Description Value Description Read 0 alarm flag inactive 0 timer flag inactive 1 alarm flag active 1 timer flag active Write 0 alarm flag is cleared 0 timer flag is cleared 1 alarm flag remains unchanged 1 timer flag remains unchanged |
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