PCA88021 NXP [NXP Semiconductors], PCA88021 Datasheet - Page 13

• Manufacturer Part Number: PCA88021
• Description: ultra low power oscillator with integrated counter for initiating one time password generation
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA8802_1
Product data sheet
Fig 23. Reading the counter
driving SDA
driving SDA
master
slave
Rd_cmd is slave address plus read bit.
S
S
START condition
1
0
1
RD_CMD
0
Example 2:
Figure 22
Example 3:
Fig 22. Setting the counter
P
0
STOP condition
0
0
Wrt_cmd is slave address plus write bit.
S
S
1
Sending dvs_cmd followed by setting the counter to A90001h is shown in
Reading the counter (counter = 000011h) is shown in
A
START condition
1
1
0
A
0
0
0
0
acknowledge from slave
0
bits 23...16 = 00h
0
SET_CMD enable
1
0
0
bits 15...8 = 00h
Rev. 01 — 19 February 2009
WRT_CMD
0
0
0
0
0
0
P
0
0
0
0
STOP condition
0
0
0
0
A
acknowledge from master
0
0
0
A
0
0
0
0
0
A
A
A
0
bits 15...8 = 00h
0
A
0
1
0
0
acknowledge from slave
0
0
0
0
A
not acknowledge from master
DVS_CMD enable
bits 23...16 = A9h
0
0
1
0
bits 7...0 = 01h
0
1
0
0
A
0
1
0
0
0
0
0
0
0
bits 7...0 = 11h
Figure
0
0
0
1
PCA8802
0
© NXP B.V. 2009. All rights reserved.
1
1
1
Smartcard RTC
0
23.
001aaj210
A
A
A
0
1
P
A
001aaj211
13 of 34
P