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Section 3 DSP Operating Unit
Rev. 3.00 Jan. 18, 2008 Page 83 of 1458
REJ09B0033-0300
3.2
DSP Mode Resources
3.2.1
Processing Modes
The CPU processing modes can be extended using the mode bit (MD) and DSP bit (DSP) in the
status register (SR), as shown below.
Table 3.1
CPU Processing Modes
Description
MD
DSP
Processing Mode
Access of Resources
Protected in Privileged Mode
or Privileged Instruction
Execution
DSP Extended
Functions
0
0
User mode
Prohibited
Invalid
0
1
User DSP mode
Prohibited
Valid
1
0
Privileged mode
Allowed
Invalid
1
1
Privileged DSP mode Allowed
Valid
As shown above, the extension of the DSP function by the DSP bit can be specified independently
of the control by the MD bit. Note, however, that the DSP bit can be modified only in privileged
mode. Before the DSP bit is modified, a transition to privileged mode or privileged DSP mode is
necessary.
3.2.2
DSP Mode Memory Map
In DSP mode, a part of the P2 area in the virtual address space can be accessed in user DSP mode.
When this area is accessed in user DSP mode, this area is referred to as a Uxy area. X/Y memory
is then assigned to this Uxy area. Accordingly, X/Y memory can also be accessed in user DSP
mode.



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