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參數(shù)資料
| 型號(hào)： | PCA8802CX8/B/1 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA8 |
| 封裝： | 1.19 X 1.14 MM, 0.29 MM HEIGHT, LEAD FREE, WLCSP-8 |
| 文件頁數(shù)： | 6/34頁 |
| 文件大?。?/td> | 160K |
| 代理商： | PCA8802CX8/B/1 |
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PCA8802_1
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 19 February 2009
14 of 34
NXP Semiconductors
PCA8802
Smartcard RTC
9.6 Instructions
9.6.1 Instruction set
[1]
Read of the counter is implicit with an interface read.
9.6.2 Instruction wrt_cmd
The write instruction (wrt_cmd) precedes each write sequence. Details of the writing
protocol can be found in Section 9.5.1.1.
9.6.3 Instruction dvs_cmd
The divider switch instruction (dvs_cmd) can be used to freeze the divider chain and to
put it in a dened state. The rst two bits of the divider chain can not be inuenced. With
this instruction it is possible to control the time to the next increment of the counter. See
Table 5.
Write instructions
The writing protocol is illustrated in Figure 10.
First byte
Second byte
Further bytes Action
Instruction Instruction code Instruction Instruction code Parameters
wrt_cmd
1010 0000
-
device slave write address: slave address
plus write bit
dvs_cmd
0001 0001
-
stop and reset dividers
0001 0000
-
start dividers
pwd_cmd
0010 0001
-
shut down the device
0010 0000
-
enable the device
32k_cmd
0011 0001
-
enable output of 32.768 kHz on pin INT
0011 0000
-
disable output of 32.768 kHz on pin INT
fst_cmd
0100 0001
-
fast mode; increments counter every
second
0100 0000
-
fast mode disable
set_cmd
1000 0000
set the counter value
P1[23:16]
parameter with counter values
P2[15:8]
P3[7:0]
Table 6.
Read instructions
The reading protocol is illustrated in Figure 11.
First byte
Further bytes Action
Instruction Instruction code Parameters
1010 0001
device slave read address: slave address plus
read bit
P1[23:16]
parameter with counter values;
continues to read until no ACK is received;
counter is not updated during this time
P2[15:8]
P3[7:0]
P4[23:16]
:
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