2
2-6
Ver.0.10
2.4 Accumulator
The accumulator (ACC) is a 56-bit register used by DSP function instructions. When read out or
written to, it is handled as a 64-bit register. When reading, the value of bit 8 is sign-extended. When
writing, bits 0--7 are ignored. Also, the accumulator is used by the multiplication instruction "MUL."
Note that when executing this instruction, the value of the accumulator is destroyed.
The "MVTACHI" and "MVTACLO" instructions are used to write to the accumulator. The
"MVTACHI" instruction writes data to the 32 high-order bits (bits 0-31), and the "MVTACLO"
instruction writes data to the 32 low-order bits (bits 32-63).
The "MVFACHI," "MVFACLO," and "MVFACMI" instructions are used to read data from the
accumulator. The "MVFACHI" instruction reads data from the 32 high-order bits (bits 0-31), the
"MVFACLO" instruction reads data from the 32 low-order bits (bits 32-63), and the "MVFACHI"
instruction reads data from the 32 middle bits (bits 16-47).
CPU
2.4 Accumulator
Note: Bits 0-7 always show the sign-extended value of bit 8. Writes to this bit field are ignored.
PC
PC
0
31(LSB)
0(MSB)
2.5 Program Counter
The Program Counter (PC) is a 32-bit counter used to hold the address of the currently executed
instruction. Because M32R instructions each start from an even address, the LSB (bit 31) is always
0.
32
48
63(LSB)
31
16
15
0(MSB)
47
7 8
Range of bits read by MVFACMI
instruction
Range of bits read/written to by
MVFACHI/MVTACHI instructions
Range of bits read/written to by
MVFACLO/MVTACLO instructions
ACC
(Note)
Содержание M32170F3VFP
Страница 19: ...CHAPTER 1 CHAPTER 1 OVERVIEW 1 1 Outline of the 32170 1 2 Block Diagram 1 3 Pin Function 1 4 Pin Layout ...
Страница 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Страница 56: ...2 2 14 Ver 0 10 This is a blank page ...
Страница 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Страница 192: ...6 6 58 Ver 0 10 INTERNAL MEMORY 6 9 Precautions to Be Taken When Rewriting Flash Memory This is a blank page ...
Страница 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Страница 498: ...10 10 228 Ver 0 10 MULTIJUNCTION TIMERS 10 9 TOM Output related 16 bit Timer This is a blank page ...
Страница 550: ...11 11 52 Ver 0 10 A D CONVERTERS 11 4 Precautions on Using A D Converters This is a blank page ...
Страница 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Страница 710: ...14 14 16 Ver 0 10 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 746: ...16 16 20 Ver 0 10 WAIT CONTROLLER 16 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 757: ...CHAPTER 18 CHAPTER 18 OSCILLATION CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit ...
Страница 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Страница 798: ...19 19 36 Ver 0 10 JTAG 19 6 Precautions about Board Design when Connecting JTAG This is a blank page ...
Страница 830: ...21 21 24 Ver 0 10 PRELIMINARY PRELIMINARY This is a blank page ELECTRICAL CHARACTERISTICS 21 5 AC Characteristics ...
Страница 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Страница 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 837: ...Appendix 2 1 32170 Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...