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PCA2125 Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA2125 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 40 page PCA2125_00 © NXP B.V. 2007. All rights reserved. Preliminary data sheet Rev. 00.11 — 30 January 2007 6 of 40 NXP Semiconductors PCA2125 SPI Real time clock / calendar 6.1 Register overview 16 registers are available. The time registers are encoded in the binary coded decimal format (BCD) to simplify application use. Other registers are either bit-wise or standard binary. Table 5: Registers overview Bit positions labelled as x are not implemented and will return a 0 when read. Bit positions labelled with 0 should always be written with logic 0. Address Register name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00HEX control 1 ext test 0 stop 0 POR ovrd 12/24 0 0 01HEX control 2 MI SI MSF TI/TP AF TF AIE TIE 02HEX seconds RF 10 seconds seconds 03HEX minutes x 10 minutes minutes 04HEX hours x x AMPM / 10 hours hours 05HEX days x x 10 days days 06HEX weekdays x x x x x weekdays 07HEX months x x x 10months months 08HEX years 10 years years 09HEX minute alarm AEn 10 minute alarm minute alarm 0AHEX hour alarm AEn x AMPM / 10 hour alarm hour alarm 0BHEX day alarm AEn x 10 day alarm day alarm 0CHEX weekday alarm AEn x x x x weekday alarm 0DHEX CLKOUT control x x x x x COF2 COF1 COF0 0EHEX timer control TE x x x x x CTD1 CTD0 0FHEX countdown timer countdown timer value, n |
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