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 17 of 86
NXP Semiconductors
PCF2127AT
Integrated RTC, TCXO and quartz crystal
8.5.5 Operation examples
8.5.5.1 Writing to the RAM
1. Set RAM address:
– Select register RAM_addr_MSB (send address 1Ah).
– Set value for bit RA8 (data byte of register 1Ah).
Note: register address will be incremented automatically to 1Bh.
– Set value for array RA[7:0] (data byte of register 1Bh).
2. Send RAM write command:
– Select register RAM_wrt_cmd (send address 1Ch).
3. Write data into the RAM:
– Write n data byte into RAM.
For details, see Figure 44 on page 62
.
8.5.5.2 Reading from the RAM
1. Set RAM address:
– Select register RAM_addr_MSB (send address 1Ah).
– Set value for bit RA8 (data byte of register 1Ah).
Note: register address will be incremented automatically to 1Bh.
– Set value for array RA[7:0] (data byte of register 1Bh).
2. Send RAM read command:
– Select register RAM_rd_cmd (send address 1Dh).
3. Read from the RAM:
– Read n data byte from the RAM.
For details, see Figure 45 on page 63
.