Z90251 Datasheet, PDF (63/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
55
Table 36 Master I²C Command Register 0Bh: Bank C (I²C_CMD)
Bit
7
6
5
4
3
2
1
0
R/W
Reset
R/W R/W R/W R/W R/W R/W R/W R/W
x
x
x
x
x
x
x
0
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Bit
Position R/W Value Description
Reserved
7
R
W
I²C Command 6, 5, 4
R
W
Return 1
No Effect
Return 1
See Table 35
Reserved
3, 2
R
W
Return 1
No Effect
Reset
1
R
Return 1
W
0 No Effect
1 Reset I²C interface
Busy
0
R
0 Idle
1 Busy
W
No Effect
Software puts data to be transmitted into I²C Data Register (Table 37) and reads
received data from it. Bit 7 in this register is used as an acknowledge bit when
receiving data from a Slave. Bit 0 of I²C_DATA register contains an
acknowledgment bit generated by the Slave. Refer to Table 38.
Table 37 Master I²C Data Register 0Ah: Bank C (I²C_DATA)
Bit
7
6
5
4
3
2
1
0
R/W
Reset
R/W R/W R/W R/W R/W R/W R/W R/W
0
0
0
0
0
0
0
0
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Data
Bit
Position
7,6,5,4,3,2,1,0
R/W Value Description
R
Received data
W
Data to be sent
PS001301-0800