PCF2127ATSLASH1 datasheet(16/80 Pages) NXP

16 / 80 page

PCF2127A_2

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Product data sheet

Rev. 02 — 7 May 2010

16 of 80

NXP Semiconductors

PCF2127A

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 60.

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 61.

PCF2127AT/1 数据表(PDF) 16 Page - NXP Semiconductors