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SH7721 Datasheet(PDF) 190 Page - Renesas Technology Corp

Part # SH7721
Description  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
PDF  1524 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7721 Datasheet(HTML) 190 Page - Renesas Technology Corp

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Section 3 DSP Operating Unit
Rev. 3.00 Jan. 18, 2008 Page 128 of 1458
REJ09B0033-0300
(1)
Carry or Borrow Mode: CS[2:0] = B'000
The DC bit indicates that carry or borrow is generated from the most significant bit of the
operation result, except the guard-bit parts. Some examples are shown in figure 3.11. This mode is
the default condition. When the input data is negative in a PABS or PNEG instruction, carry is
generated.
Example 1
Carry detecting point
Guard bits
Carry is detected
0000
0000
+)
0000
0000
1111
0000
1111
0000
1111
0000
1111
0001
0000 0001 0000 0000 0000 0000
Example 2
Carry detecting point
Guard bits
Carry is not detected
1111
0011
+)
1111
1111
0111
0001
0000
0000
0000
0000
0000
0000
0011
(1)
11101000 0000 0000 0000
Example 3
Borrow detecting point
Guard bits
Borrow is not detected
0000
0000
–)
0000
0000
0000
0000
0000
0000
0000
0000
0001
0001
0000 0000 0000 0000 0000 0000
Example 4
Borrow detecting point
Guard bits
Borrow is detected
0000
0000
–)
0000
0000
0001
0001
0000
0000
0000
0000
0001
0010
111111111111111111111111
Figure 3.11 DC Bit Generation Examples in Carry or Borrow Mode



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