PCA8575 查看數據表（PDF） - Philips Electronics
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PCA8575 Datasheet PDF : 30 Pages
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SCL 1 2 3 4 5 6 7 8 9
SDA
S 0 1 0 0 A2 A1 A0 1 A
START condition
read from port 0
R/W
acknowledge
from slave
P0x
DATA 00
A
acknowledge
from master
P1x
DATA 11
A
acknowledge
from master
P0x
DATA 00
A
acknowledge
from master
P1x
DATA 12
1P
no acknowledge
from master
data into port 0
read from port 1
DATA 00
data into port 1
DATA 10
DATA 11
DATA 12
INT
tv(D)
td(rst)
002aab810
Transfer of data can be stopped at any moment by a STOP condition. When this occurs, data present at the latest acknowledge phase is valid (output mode).
Fig 12. Read input port register, scenario 1
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