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參數(shù)資料
| 型號： | 935262899118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 144K |
| 代理商： | 935262899118 |
Philips Semiconductors
Product specification
PCA9556
Octal SMBus Registered Interface
1998 Dec 18
7
1
A2
A1 A0
0
1
A2
A1
A0
0
S0
A
COMMAND BYTE
acknowledge
from slave
R/W
acknowledge
from slave
A
P
NA
acknowledge
from slave
acknowledge
from master
S
DATA
R/W
first byte
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
last byte
su01052
no acknowledge
from master
1
slave address
data from register
slave address
Figure 8. READ from register via Read byte protocol
00
1
A2
A1
A0
READ FROM
PORT
DATA INTO
PORT
SDA
S1
A
DATA 1
DATA 4
slave address
data from port
start condition
R/W
acknowledge
from slave
acknowledge
from master
stop
condition
tps
DATA 4
DATA 2
P
DATA 3
tph
Notes:
1. This figure assumes the command byte has previously been programmed with 00h.
2. Transfer of data can be stopped at any moment by a stop condition. When this occurs,
data present at the last acknowledge phase is valid (output mode). Input data is lost.
su01051
no acknowledge
from master
NA
Figure 9. READ input port register via Receive byte protocol
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