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2
I
C Control Register
b7 b6 b5 b4 b3 b2 b1 b0
2
Fig. 6.7.10 I
C control register
I
2
C control register (S1D : address 00DA
B
Name
Bit counter
0
(Number of transmit/recieve
to
bits)
2
(BC0 to BC2)
3
2
I
C-BUS interface use
enable bit (ESO)
4
Data format selection bit
(ALS)
5
Addressing format selection
bit (10BIT SAD)
6, 7 Connection control bits
2
between I C-BUS interface
and ports
(BSEL0, BSEL1)
Note: When using ports P1
-P1
as I C-BUS interface, the output structure changes
1
4
automatically from CMOS output to N-channel open-drain output. However, set
the port direction register to "1" (output mode).
7220 Group User's Manual
6.7 Control registers
)
16
Functions
b2 b1 b0
0
0
0 : 8
0
0
1 : 7
0
1
0 : 6
0
1
1 : 5
1
0
0 : 4
1
0
1 : 3
1
1
0 : 2
1
1
1 : 1
0 : Disabled
1 : Enabled
0 : Addressing mode
1 : Free data format
0 : 7-bit addressing format
1 : 10-bit addressing format
b7 b6 Connection port
0
0 : None
0
1 : SCL1, SDA1
1
0 : SCL2, SDA2
1
1 : SCL1, SDA1
SCL2, SDA2
2
APPENDIX
After reset R W
0
R W
0
R W
0
R W
0
R W
0
R W
Address 00DA
16
6-35
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