HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 76
HD6417641
Manufacturer Part Number
HD6417641
Description
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417641.pdf
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Section 2 CPU
The system registers are accessed by the LDS/STS instructions (the PC is software-accessible, but
is included here because its contents are saved in, and restored from, SPC in exception handling).
The system registers are:
• MACH: Multiply and accumulate high register
• MACL: Multiply and accumulate low register
• PR: Procedure register
• PC: Program counter
This section explains the usage of these registers in different modes.
Figures 2.1 and 2.2 show the register configuration in each processing mode.
The DSP mode is switched by means of the DSP bit in the status register.
Rev. 4.00 Sep. 14, 2005 Page 26 of 982
REJ09B0023-0400
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