PCA9556 Просмотр технического описания (PDF) - Philips Electronics
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PCA9556 Datasheet PDF : 13 Pages
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Philips Semiconductors
Octal SMBus and I2C registered interface
Product data
PCA9556
slave address
acknowledge
from slave
S 0 0 1 1 A2 A1 A0 0 A
R/W
acknowledge
from slave
slave address
acknowledge
from slave
acknowledge
data from register from master
COMMAND BYTE
A S 0 0 1 1 A2 A1 A0 1 A
R/W
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
DATA
A
first byte
data from register
no acknowledge
from master
DATA
last byte
NA P
Figure 9. READ from register via Read byte protocol
su01052
SDA
READ FROM
PORT
slave address
data from port
S 0 0 1 1 A2 A1 A0 1 A
start condition
R/W acknowledge
from slave
DATA 1
data from port
A
acknowledge
from master
DATA 4
NA P
no acknowledge
from master
stop
condition
DATA INTO
PORT
DATA 2
DATA 3
tph
tps
DATA 4
SW00799
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.
Figure 10. READ input port register via Receive byte protocol
2002 Mar 28
8
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