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 72 of 86
NXP Semiconductors
PCF2127AT
Integrated RTC, TCXO and quartz crystal
Fig 51. SPI-bus timing
013aaa152
R/W SA2 RA0 b7 b6 b0
b7 b6 b0
b0b6b7SDI
SDO
SDO
high-Z
high-Z
SDI
SCL
CE
WRITE
READ
t
w(CE_N)
80%
20%
t
clk(L)
t
f
t
h(CE_N)
t
rec(CE_N)
t
dis(SDO)
t
d(R)SDO
t
r
t
h
t
su
t
clk(H)
t
su(CE_N)
t
clk(SCL)
t
t(SDI-SDO)