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M32000D4BFP-80 Datasheet(Fiches technique) 13 Page - Mitsubishi Electric Semiconductor

Numéro de pièce M32000D4BFP-80
Description  SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER   
Télécharger  44 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
M32000D4BFP-80
13
Data types
Signed and unsigned integers of byte (8 bits), halfword (16 bits), and
word (32 bits) types are supported as data in the M32R CPU instruc-
tion set. A signed integer is represented in a 2's complement format.
Data formats
Data size of a register of the M32R CPU is always a word (32 bits).
Byte (8 bits) and halfword (16 bits) data in memory are sign-extended
(the LDB and LDH instructions) or zero-extended (the LDUB and
LDUH instructions) to 32 bits, and loaded into the register.
Word (32 bits) data in a register is stored to memory by the ST in-
struction. Halfword (16 bits) data in the LSB side of a register is stored
to memory by the STH instruction. Byte (8 bits) data in the LSB side
of a register is stored to memory by the STB instruction.
Data stored in memory can be one of these types: byte (8 bits),
halfword (16 bits) or word (32 bits).
Although the byte data can be located at any address, the halfword
data and the word data can only be located on the halfword bound-
ary and the word boundary, respectively. If an attempt is made to
access data in memory which is not located on the correct boundary,
an address exception occurs.
signed byte
(8-bit) integer
unsigned byte
(8-bit) integer
signed halfword
(16-bit) integer
0
0
0
0
0
0
7
7
15
15
31
31
S
S
S
S: sign bit
unsigned halfword
(16-bit) integer
signed word
(32-bit) integer
unsigned word
(32-bit) integer
Rn
0
31
< load >
byte
Rn
0
31
halfword
Rn
0
31
word
sign-extention (LDB instruction) or
zero-extention (LDUB instruction)
from memory
(LDB, LDUB instruction)
< store >
Rn
0
31
byte
Rn
0
31
halfword
Rn
0
31
word
to memory (STB instruction)
to memory (STH instruction)
to memory (ST instruction)
from memory (LDH, LDUH instruction)
from memory (LD instruction)
24
16
24
16
sign-extention (LDH instruction) or
zero-extention (LDUH instruction)
<data format in a register>
<data format in memory>
Fig. 7 Data type
Fig. 8 Data format
address
byte
halfword
word
+ 0
+ 1
+ 2
+ 3
031
byte
byte
byte
byte
halfword
halfword
word
7 8
15 16
23 24




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