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The following table shows which bits can be used as I/O bits in each of the
K-type CPUs. Bits in the shaded areas can be used as work bits but not as
output bits.
08
09
10
11
12
13
14
15
Word 00
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word 01
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word 00
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word 01
C20K
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word 00
00
01
02
03
04
05
06
07
Word 02
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word 01
00
01
02
03
04
05
06
07
Word 03
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word 00
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word 02
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word 01
00
01
02
03
04
05
06
07
Word 03
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Model Input bits
Output bits
C28K
C40K
C60K
08
09
10
11
indicates words that cannot be used for I/O,
but can be used as work bits.
Cannot
be
used.
Cannot
be
used.
I/O Bits Available in CPUs
Internal Relay (IR) Area Section 3-3