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 62 of 86
NXP Semiconductors
PCF2127AT
Integrated RTC, TCXO and quartz crystal
Fig 44. Bus protocol, writing to RAM
001aaj720
S
slave address
1 0 1 0 0 0 1 0
write bit
A A
set RAM
address
RAM write
command
write data
to RAM
acknowledge
from PCF2127AT
acknowledge
from PCF2127AT
register address 1Ah
A A
acknowledge
from PCF2127AT
P/S
slave address
0 to n
data bytes
1 0 1 0 0 0 1 0
write bit
A A
acknowledge
from PCF2127AT
acknowledge
from PCF2127AT
acknowledge
from PCF2127AT
register address 1Ch
acknowledge
from PCF2127AT
data byte 1Bhdata byte 1Ah
A Pdata byte (RAM address)