mm1250 Mitsumi Electronics, Corp., mm1250 Datasheet - Page 7

• Manufacturer Part Number: mm1250
• Description: I 2c Bus Compatible Video Switch
• Manufacturer: Mitsumi Electronics, Corp.

MITSUMI
I
2
The I
Data is transferred on two lines, SDA and SCL.
Data is transferred in byte units, and MSB is first from start condition.
1. Data format
The first 7 bits of the address byte is the salve address, and the last bit is allocated as R/W bit. On
MM1250XD, 92
The A at the 9th bit is an acknowledge signal added for verification from slave.
2. Control byte format
Control byte configuration on MM1250XD is allocated as shown in the table below.
Each bit is set at "0" when power is turned on.
SW V, L, R control
Audio Mute control
C Bus
S
Mute
SW1
0
0
1
1
0
1
2
Control
C bus (Inter IC Bus) is a bus system developed by Philips.
1
SDA
SCL
SW
Mute
L
SW0
0
OUT
0
1
0
1
•
L
H
Slave address
S
is used for the slave address and 0 (write only) for the R/W bit.
0
MODE1
SW
Mute
Address byte
R
TV
TV
OUT
MSB
E1
E2
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
•
1
R
1
Control results
0
V
V
V
V
V
2
OUT
E
E
TV
TV
1
2
Out Port control
0
OUT Pin 13 status
3
0
1
L
L
L
L
L
1
OUT
E
E
TV
TV
1
2
OUT Mute SW2 SW1 SW0
4
R/W
Open
0
Low
R
R
R
R
R
OUT
E
E
TV
TV
5
1
2
A
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
6
SW Y, C control
MODE1
7
TV
TV
E1
E2
E1
E2
LSB
8
I
Control byte
Control bits
2
C Bus Compatible Video Switch MM1250
Control
ACK
S4
B
B
A
A
-
-
-
-
S:Start Condition
P:Stop Condition
ACK:Acknowledge
MSB
: Don't Care
1
SW2
0
0
0
0
1
1
1
1
2
Mode2 SW
Comp
Comp
Comp
TH
TH
TH
S
S
ACK
Control results
A
V
V
V
V
V
Y
Y
Y
E
E
E
E
IN
IN
IN
TV
P
•
1
1
1
2
Y
P
SW
S
S
V
V
V
C
C
C
CIN
CIN
E
E
TV
IN
IN
IN
•
1
2
C