PCA8802 datasheet(12/34 Pages) NXP

12 / 34 page

PCA8802_1

Product data sheet

Rev. 01 — 19 February 2009

12 of 34

NXP Semiconductors

PCA8802

Smartcard RTC

9.5.7.1

Example data transfers

Example 1: Sending the instruction dvs_cmd followed by fst_cmd is shown in Figure 21.

Fig 18. A master-transmitter addresses a slave receiver

Fig 19. A master reads from a slave immediately after the ﬁrst byte

001aaj202

DATA

A/A

SLAVE ADDRESS + write

from master to slave

data transferred

(n bytes + acknowledge)

from slave to master

A = acknowledge (SDA LOW)

A = not acknowledge (SDA HIGH)

S = START condition

P = STOP condition

001aaj203

DATA

SLAVE ADDRESS + read

data transferred

(n bytes + acknowledge)

(1) Not shaded because transfer direction of data and acknowledge bits depends on R/W bits.

Fig 20. Combined format

001aaj204

DATA

SLAVE ADDRESS + write or read

direction of transfer

may change at this

point

n bytes

+ ack.(1)

n bytes

+ ack.(1)

Sr = repeated START condition

A/A

DATA

SLAVE ADDRESS + write or read

A/A

Wrt_cmd is slave address plus write bit.

Fig 21. Sending instructions

001aaj209

wrt_cmd

dvs_cmd enable

fst_cmd enable

START condition

STOP condition

acknowledge from slave

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