pcf8534 NXP Semiconductors, pcf8534 Datasheet - Page 22

• Manufacturer Part Number: pcf8534
• Description: Universal Driver Multiplex Rates
• Manufacturer: NXP Semiconductors

Fig 15. I
Fig 16. Control byte format
(1) C
(2) C
(3) RS = 0; data is a command byte
(4) Rs = 1; data is a display byte
2
0
0
C-bus protocol
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx
EXAMPLES
a) transmit two bytes of RAM data
b) transmit two command bytes
c) transmit one command byte and two RAM bytes
S 0 1 1 1 0
S 0 1 1 1 0
S 0 1 1 1 0
S 0 1 1 1 0
= 0; last control byte
= 1; control bytes continue
slave address
0
0
0
0
R/W = 0
S
A
S
A
S
A
S
A
0
0
0
0
0
0
0
0
A
A
A
A
Co RS
0 1
1 0
1 0
control byte
MSB
A
A
A
A
Co RS
M
S
B
RAM/command byte
RAM DATA
COMMAND
COMMAND
S
B
L
P
A
A
A
UNUSED
0 0
0 1
RAM DATA
MGL753
LSB
A
A
A
P
COMMAND
RAM DATA
A
A
P
RAM DATA
MGL752
A
P