PCA88021 NXP [NXP Semiconductors], PCA88021 Datasheet - Page 9

• 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 11. Reading protocol
reading multiple data parameters
S
S
A
Rd_cmd is slave address plus read bit.
START condition
acknowledge from master
9.5.1.2 The reading protocol
9.5.1.3 Reading and writing limitations
rd_cmd
The reading protocol is shown in
As the counter is frozen during interface accesses, all access must be completed within
32 seconds (see
A
Fig 10. Writing protocol
Fig 12. Access restrictions
1
P
st
parameter
writing 2 consecutive instructions
writing 2 consecutive instructions with instruction parameters
STOP condition
S
S
S
Wrt_cmd is slave address plus write bit.
Wrt_cmd is slave address plus write bit.
Rd_cmd is slave address plus read bit.
START condition
wrt_cmd
wrt_cmd
A
Figure
2
nd
parameter
Rev. 01 — 19 February 2009
A
A
S
S
A
P
12). If this rule is not adhered to, then counts will be dropped.
acknowledge from slave
not acknowledge from master
A
A
P
START condition
acknowledge from slave
STOP condition
wrt_cmd/
STOP condition
rd_cmd
A
instruction
instruction
3
rd
Figure
parameter
A
11.
instr. parameter 3
A
A
A
A
must be < 32 seconds
instruction transfer
acknowledge from slave
4
instr. parameter 1
th
parameter
instruction
A
A
001aaj205
A
A
instruction
instr. parameter 2
n
P
P
th
parameter
PCA8802
© NXP B.V. 2009. All rights reserved.
Smartcard RTC
A
001aaj207
A
001aaj213
A
P
P
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