– 29 –
S
1
1
0
0
0
0
0
0
0
S
T
A
R
T
DEVICE CODE
CONTROL BYTE
A
C
K
READ/WRITE
WORD
ADDRESS(n)
DATA n
DATA n+1
DATA n+7
S
T
O
P
P
NOTE : ACK=ACKNOWLEDGE BIT
Write-In Mode
S
1
1
0
0
1
0
0
0
0
P
Read-Out Mode
CPU
CPU
CPU
CPU
A
C
K
A
C
K
A
C
K
A
C
K
CONTROL BYTE
READ/WRITE
NOTE : ACK=ACKNOWLEDGE BIT
DEVICE CODE
S
T
A
R
T
A
C
K
S
T
O
P
A
C
K
DATA n
DATA n+X
S
1
1
0
0
0
0
0
0
0
S
T
A
R
T
DEVICE CODE
CONTROL BYTE
A
C
K
READ/WRITE
WORD
ADDRESS(n)
A
C
K
