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2
2-10
32180 Group User’s Manual (Rev.1.0)
CPU
2.6 Data Formats
Bit endian
(H'01)
Byte endian
(H'01234567)
Big endian
Little endian
Note: • Even when bits are arranged in big endian, H'01 is not B'10000000.
HH
HL
LH
LL
H'01
H'23
H'45
H'67
LL
LH
HL
HH
H'67
H'45
H'23
H'01
B'0000001
b0
b7
B'0000001
b7
b0
Figure 2.6.4 General Endian System
(2) Data formats in memory
The data sizes in memory can be byte (8 bits), halfword (16 bits) or word (32 bits). Although byte data can
be located at any address, halfword and word data must be located at the addresses aligned with a
halfword boundary (least significant address bit = "0") or a word boundary (two low-order address bits =
"00"), respectively. If an attempt is made to access memory data that overlaps the halfword or word bound-
ary, an address exception occurs.
Figure 2.6.3 Data Formats in Memory
(3) Endian
The diagrams below show a general endian system and the endian adopted for the M32R family of
Mitsubishi microcomputers.
Address
Byte
Halfword
Word
+0 address
+1 address
+2 address
+3 address
b0
b31
Byte
Byte
Byte
Byte
Halfword
Halfword
Word
7
8
15 16
23 24
b0
15
b0
b31
b31
Содержание M32R/ECU Series
Страница 17: ...12 This page is blank for reasons of layout...
Страница 18: ...CHAPTER 1 OVERVIEW 1 1 Outline of the 32180 Group 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Assignments...
Страница 712: ...CHAPTER 18 OSCILLATOR CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit...
Страница 794: ...CHAPTER 22 TYPICAL CHARACTERISTICS...
Страница 795: ...22 22 2 32180 Group User s Manual Rev 1 0 TYPICAL CHARACTERISTICS To be written at a later time...
Страница 796: ...APPENDIX 1 MECHANICAL SPECIFICAITONS Appendix 1 1 Dimensional Outline Drawing...
Страница 798: ...APPENDIX 2 INSTRUCTION PROCESSING TIME Appendix 2 1 32180 Instruction Processing Time...
Страница 802: ...APPENDIX 3 PROCESSING OF UNUSED PINS Appendix 3 1 Example Processing of Unused Pins...