HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 115

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Extension of Status Register (SR): In DSP mode, the following control bits are added to the
status register (SR). These added bits are called DSP extended bits. These DSP extended bits are
valid only in DSP mode.
Note: When data is written to the SR register, 0 should be written to reserved bits (bits 31, 15 to
Bit
31 to 28 
27 to 16 RC11 to RC0 All 0
15 to 13 
12
11
10
9 to 4
3
2
1 to 0
13).
Bit Name
DSP
DMY
DMX

FR1
FR0

Initial
Value R/W


0
0
0

0
0


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
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 and privileged DSP
mode; not in user DSP mode. At reset, this bit is initialized
to 0. This bit is not affected in the exception handling state.
Modulo Control
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 not affected in the
exception handling state.
For details, refer to section 2, CPU.
Repeat Flag
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 not affected in the exception handling state.
For details, refer to section 2, CPU.
Rev. 1.00, 02/04, page 77 of 804