PCF8564ACX9SLASHBSLASH1 datasheet(24/44 Pages) NXP

24 / 44 page

PCF8564A_1

Product data sheet

Rev. 1 — 8 October 2009

24 of 44

NXP Semiconductors

PCF8564A

Real time clock and calendar

Fig 18. Master reads word after setting word address (write word address; READ data)

SLAVE ADDRESS

WORD ADDRESS

SLAVE ADDRESS

acknowledgement

from slave

R/W

013aaa034

R/W

acknowledgement

from slave

acknowledgement

from slave

acknowledgement

from master

no acknowledgement

from master

auto increment

memory word address

auto increment

memory word address

at this moment master transmitter

becomes master receiver and

PCF8564A slave receiver

becomes slave transmitter

last byte

DATA

n bytes

Fig 19. Master reads slave immediately after ﬁrst byte (READ mode)

SLAVE ADDRESS

DATA

acknowledgement

from slave

acknowledgement

from master

no acknowledgement

from master

R/W

auto increment

word address

mgl665

auto increment

word address

n bytes

last byte

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