Read Sony DSC-U20 (serv.man4) Service Manual online
DSC-U20
6-33
2.
Bit Value Discrimination
In the following items, the bit values must be discriminated from
the data displayed on the SEUS. Whether bit values are “1” or “0”
can be discriminated from the table shown below.
the data displayed on the SEUS. Whether bit values are “1” or “0”
can be discriminated from the table shown below.
Data displayed on SEUS
0 0
bit 3 to bit 0 discriminated
bit 7 to bit 4 discriminated
Bit values
Display on the
bit3
bit2
bit1
bit0
SEUS
or
or
or
or
bit7
bit6
bit5
bit4
0
0
0
0
0
1
0
0
0
1
2
0
0
1
0
3
0
0
1
1
4
0
1
0
0
5
0
1
0
1
6
0
1
1
0
7
0
1
1
1
8
1
0
0
0
9
1
0
0
1
A
1
0
1
0
B
1
0
1
1
C
1
1
0
0
D
1
1
0
1
E
1
1
1
0
F
1
1
1
1
B
A
3.
Switch Check (1)
Page 20
Address 80
Bit
Function
When bit value=1 When bit value=0
POWER SW
0
(SW-376 flexible)
OFF
ON
(S002)
1
LENS COVER SW
2
(OP-17 flexible)
CLOSE
OPEN
(S101)
SHUTTER button
3
(XAE LOCK SW)
OFF
ON
(SW-376 flexible)
(S003)
(S003)
SHUTTER button
4
(XSHUTTER)
OFF
ON
(SW-376 flexible)
(S003)
(S003)
Using method:
1) Select page: 20, address: 80.
2) By discriminating the bit value of read data, the state of the
1) Select page: 20, address: 80.
2) By discriminating the bit value of read data, the state of the
switches can be discriminated.
Example: If the displayed data is “8E”, bit 7 - bit 4 values can be
discriminated from block (A), and also bit 3 - bit 0 val-
ues from block (B).
ues from block (B).
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