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M32000D3FP Datasheet(Fiches technique) 12 Page - Mitsubishi Electric Semiconductor

Numéro de pièce M32000D3FP
Description  SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER  
Télécharger  45 Pages
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Fabricant  MITSUBISHI [Mitsubishi Electric Semiconductor]
Site Internet  http://www.mitsubishichips.com
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SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
M32000D3FP
12
Accumulator
The accumulator (ACC) is a 64-bit register used for DSP type func-
tions. Use the MVTACHI and MVTACLO instructions for writing to
the accumulator. The high-order 32 bits (bit 0 - bit 31) can be set with
the MVTACHI instruction and the low-order 32 bits (bit 32 - bit 63)
can be set with the MVTACLO instruction. Use the MVFACHI,
MVFACLO and MVFACMI instructions for reading from the accumu-
lator. The high-order 32 bits (bit 0 - bit 31) are read with the MVFACHI
instruction, the low order 32 bits (bit 32 - bit 63) with the MVFACLO
instruction and the middle 32 bits (bit 16 - bit 47) with the MVFACMI
instruction.
Program counter
The program counter (PC) is a 32-bit counter that retains the ad-
dress of the instruction being executed. Since the M32R CPU in-
struction starts with even-numbered addresses, the LSB (bit 31) is
always "0".
Fig. 5 Accumulator
31
0
PC
PC
0
Fig. 6 Program counter
32
48
63
31
16
15
0
47
78
ACC
(see note)
read/write range with
MVTACLO or MVFACLO instruction
read/write range with
MVTACHI or MVFACHI instruction
read range with MVFACMI instruction
Note: Bits 0 - 7 are always read as the sign-extended value of bit 8.
An attempt to write to this area is ignored.




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