mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 80
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mcf5407
Manufacturer Part Number
mcf5407
Description
Mcf5407 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5407.pdf
(546 pages)
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Organization of Data in Registers
operands are sign-extended to 32 bits and then used in the operation with anaddress register
destination. When an address register is a destination, the entire register is affected,
regardless of the operation size. Figure 2-8 shows integer formats for address registers.
The size of control registers varies according to function. Some have undefined bits
reserved for future definition by Motorola. Those particular bits read as zeros and must be
written as zeros for future compatibility.
All operations to the SR and CCR are word-size operations. For all CCR operations, the
upper byte is read as all zeros and is ignored when written, regardless of privilege mode.
2.4.2 Organization of Integer Data Formats in Memory
All ColdFire processors use a big-endian addressing scheme. The byte-addressable
organization of memory allows lower addresses to correspond to higher order bytes. The
address N of a longword data item corresponds to the address of the high-order word. The
lower order word is located at address N + 2. The address N of a word data item corresponds
to the address of the high-order byte. The lower order byte is located at address N + 1. This
organization is shown in Figure 2-9.
2-14
31
Byte 0xFFFF_FFFC
Byte 0x0000_0000
Byte 0x0000_0004
Figure 2-8. Organization of Integer Data Formats in Address Registers
31
31
Word 0xFFFF_FFFC
Word 0x0000_0000
Word 0x0000_0004
Sign-Extended
Figure 2-9. Memory Operand Addressing
23
Byte 0xFFFF_FFFD
Byte 0x0000_0001
Byte 0x0000_0005
Full 32-Bit Address Operand
MCF5407 User’s Manual
Longword 0xFFFF_FFFC
Longword 0x0000_0000
Longword 0x0000_0004
16
.
.
.
15
15
Byte 0xFFFF_FFFE
Byte 0x0000_0002
Byte 0x0000_0006
16-Bit Address Operand
Word 0xFFFF_FFFE
Word 0x0000_0002
Word 0x0000_0006
7
Byte 0xFFFF_FFFF
Byte 0x0000_0003
Byte 0x0000_0007
0
0
0
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