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PCF2123BS Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCF2123BS Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 55 page PCF2123_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 4 December 2009 8 of 55 NXP Semiconductors PCF2123 SPI Real time clock/calendar 9.2 Register overview 16 registers are available. The time registers are encoded in the Binary Coded Decimal (BCD) format to simplify application use. Other registers are either bit-wise or standard binary. [1] Except in the case of software reset, see Section 9.5. Table 4. Registers overview Bit positions labelled as - are not implemented and will return a 0 when read. Bit positions labelled with N should always be written with logic 0[1]. Address Register name Bit 7 6 5 4 3 2 1 0 Control and status registers 00h Control_1 EXT_TEST N STOP SR N 12_24 CIE N 01h Control_2 MI SI MSF TI_TP AF TF AIE TIE Time and date registers 02h Seconds OS SECONDS (0 to 59) 03h Minutes - MINUTES (0 to 59) 04h Hours - - AMPM HOURS (1 to 12) in 12 h mode HOURS (0 to 23) in 24 h mode 05h Days - - DAYS (1 to 31) 06h Weekdays - - - - - WEEKDAYS (0 to 6) 07h Months - - - MONTHS (1 to 12) 08h Years YEARS (0 to 99) Alarm registers 09h Minute_alarm AE_M MINUTE_ALARM (0 to 59) 0Ah Hour_alarm AE_H - AMPM HOUR_ALARM (1 to 12) in 12 h mode HOUR_ALARM (0 to 23) in 24 h mode 0Bh Day_alarm AE_D - DAY_ALARM (1 to 31) 0Ch Weekday_alarm AE_W - - - - WEEKDAY_ALARM (0 to 6) Offset register 0Dh Offset_register MODE OFFSET[6:0] Timer registers 0Eh Timer_clkout - COF[2:0] TE - CTD[1:0] 0Fh Countdown_timer COUNTDOWN_TIMER[7:0] |
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