Fujitsu FR60 Hardware Manual page 379

■ Change Point Detection
The bit search module scans data written to the change point detection data register from bit 30 to the LSB
for comparison with the MSB value.
The first location where a value that is different from that of the MSB is detected is returned.
The detection result can be obtained by reading the detection result register.
The relationship between the detected location and the return value is given in Table 11.2-1 .
If a change point is not detected, 32 is returned. In change point detection, 0 is never returned as a result.
[Execution example]
00100000000000000000000000000000
00000001001000110100010101100111
00000000000000111111111111111111
00000000000000000000000000000001
00000000000000000000000000000000
11111111111111111111000000000000
11111000010010011110000010101010
10000000000000101010101010101010
11111111111111111111111111111111
Table 11.2-1 lists bit locations and the corresponding return values (decimal).
Table 11.2-1 Bit Locations and Return Values (decimal)
Detected Return
bit location value
31 0
30 1
29 2
28 3
27 4
26 5
25 6
24 7
Write data
Detected Return
bit location value
23 8
22 9
21 10
20 11
19 12
18 13
17 14
16 15
Read value (decimal)
(20000000
B
(01234567
B
(0003FFFF
B
(00000001
B
(00000000
B
(FFFFF000
B
(F849E0AA
B
(8002AAAA
B
(FFFFFFFF
B
Detected Return
bit location value
15 16
14 17
13 18
12 19
11 20
10 21
9 22
8 23
→ 2
)
H
→ 7
)
H
→ 14
)
H
→ 31
)
H → 32
)
→ 20
H
)
→ 5
H
→ 1
)
H
→ 32
)
H
)
H
Detected Return
bit location value
7 24
6 25
5 26
4 27
3 28
2 29
1 30
0 31
Not found 32
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