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slave address (PCF8574)
data from port
SDA
S 0 1 0 0 A2 A1 A0 1 A
DATA 1
READ FROM
PORT
start condition
R/W acknowledge
from slave
DATA INTO
PORT
INT
t iv
DATA 2
t ph
t ir
DATA 3
data from port
A
acknowledge
from slave
DATA 4
t ps
t ir
DATA 4
1P
stop
condition
MBD975
A LOW-to-HIGH transition of SDA, while SCL is HIGH is defined as the stop condition (P). 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.
Fig.12 READ mode (input).