Datasheet

PCF2127AT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6 — 11 July 2013 9 of 86
NXP Semiconductors
PCF2127AT
Integrated RTC, TCXO and quartz crystal
RAM registers
1AhRAM_addr_MSB-------RA8-------0
1Bh RAM_addr_LSB RA[7:0] 0000 0000
1ChRAM_wrt_cmdXXXXXXXXXXXX XXXX
1DhRAM_rd_cmdXXXXXXXXXXXX XXXX
Table 5. Register overview
…continued
Bit positions labeled as - are not implemented and will return a 0 when read. Bit T must always be written with logic 0. Bits
labeled as X are undefined at power-on and unchanged by subsequent resets.
Address Register name Bit Reset value
7 6 5 4 3 2 1 0