HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 147

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

(1)
In DSP mode, the following control bits are added to the status register (SR). These added bits are
called DSP extension bits. These DSP extension bits are valid only in DSP mode.
Note: When data is written to the SR register, 0 should be written to bits that are specified as 0.
Bit
31 to 28
27 to 16
15 to 13
12
11
10
9 to 4
3
2
1, 0
Extension of Status Register (SR)
Bit Name

RC11 to
RC0

DSP
MDY
MDX

FR1
FR0

Initial
Value

All 0

0
0
0

0
0

R/W

R/W

R/W
R/W
R/W

R/W
R/W

Description
For details, refer to section 2, CPU.
Repeat Counter
Holds the number of repeat times in order to perform
loop control, and can be modified in privileged mode,
privileged DSP mode, or user DSP mode. At reset, this
bit is initialized to 0. This bit is not affected in the
exception handling state.
For details, refer to section 2, CPU.
DSP Bit
Enables or disables the DSP extended functions. If
this bit is set to 1, the DSP extended functions are
enabled. This bit can be modified in privileged mode,
privileged DSP mode, or user DSP mode. At reset, this
bit is initialized to 0. This bit is not affected in the
exception handling state.
Modulo Control Bits
Enable or disable modulo addressing for X/Y memory
access. These bits can be modified in privileged mode,
privileged DSP mode, or user DSP mode. At reset,
these bits are initialized to 0. These bits are affected in
the exception handling state.
For details, refer to section 2, CPU.
Repeat Flag Bits
Used by repeat control instructions. These bits can be
modified in privileged mode, privileged DSP mode, or
user DSP mode. At reset, these bits are initialized to 0.
These bits are affected in the exception handling state.
For details, refer to section 2, CPU.
Rev. 3.00 Jan. 18, 2008 Page 85 of 1458
Section 3 DSP Operating Unit
REJ09B0033-0300