PCF2127ATSLASH1 datasheet(15/80 Pages) NXP

15 / 80 page

PCF2127A_2

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Product data sheet

Rev. 02 — 7 May 2010

15 of 80

NXP Semiconductors

PCF2127A

Integrated RTC, TCXO and quartz crystal

8.5 General purpose 512 bytes static RAM

The PCF2127A contains a general purpose 512 bytes static RAM. This integrated SRAM

is battery backed and can therefore be used to store data which is essential for the

application to survive a power outage.

9 bits, RA[8:0], define the RAM address pointer in registers RAM_addr_MSB and

RAM_addr_LSB. The register address pointer increments after each read or write

automatically up to 1Bh and then wraps around to address 00h (see Figure 3 on page 6).

Data is transferred to or from the RAM via the interface. To write to the RAM, the register

RAM_wrt_cmd, to read from the RAM the register RAM_rd_cmd must be addressed

explicitly.

8.5.1 Register RAM_addr_MSB

8.5.2 Register RAM_addr_LSB

8.5.3 Register RAM_wrt_cmd

8.5.4 Register RAM_rd_cmd

Table 13.

RAM_addr_MSB - RAM address MSB register (address 1Ah) bit description

Bit

Symbol

Description

7 to 1

unused

RA8

RAM address, MSB (9th bit)

Table 14.

RAM_addr_LSB - RAM address LSB register (address 1Bh) bit description

Bit

Symbol

Description

7 to 0

RA[7:0]

RAM address, LSB (1st to 8th bit)

Table 15.

RAM_wrt_cmd - RAM write command register (address 1Ch) bit description

Bit

Symbol

Description

7 to 0

data to be written into RAM

Table 16.

RAM_rd_cmd - RAM read command register (address 1Dh) bit description

Bit

Symbol

Description

7 to 0

data to be read from RAM

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