MAC7200 datasheet(190/976 Pages) FREESCALE

190 / 976 page

Accessing registers

MAC7200 Microcontroller Family Reference Manual, Rev. 2

112

Freescale Semiconductor

9.8

Accessing registers

All registers use bit 31 to represent the most significant bit (msb), and bit 0 to represent the least significant

bit (lsb). All memory-mapped registers may be accessed using properly aligned 8-bit, 16-bit or 32-bit

accesses, except where indicated. This means that all addresses may be accessed using 8-bit accesses, all

even addresses may be accessed using 16-bit accesses, and every fourth address may be accessed using

32-bit accesses. On the MAC7200 family, which are big-endian devices, this results in the following

9.8.1

32-bit Register Accesses

A read to the above register will result in the following values:

All other accesses (i.e., 16-bit READ from $0000 0001) are not allowed.

9.8.2

16-bit Register Accesses

A read to the above register will result in the following values:

All other accesses (i.e.-16-bit READ from $0000 0001) are not allowed.

$0000 0000

32-bit Register REG

8-bit READ from $0000 0000

returns REG[31:24]

8-bit READ from $0000 0001

returns REG[23:16]

8-bit READ from $0000 0002

returns REG[15:8]

8-bit READ from $0000 0003

returns REG[7:0]

16-bit READ from $0000 0000

returns REG[31:16]

16-bit READ from $0000 0002

returns REG[15:0]

32-bit READ from $0000 0000

returns REG[31:0]

$0000 0000

16-bit Register REG

8-bit READ from $0000 0000

returns REG[15:8]

8-bit READ from $0000 0001

returns REG[7:0]

16-bit READ from $0000 0000

returns REG[15:0]

32-bit READ from $0000 0000 returns

REG[15:0] + the next 16 bits in the memory map

MAC7200 Datasheet(PDF) 190 Page - Freescale Semiconductor, Inc

MAC7200 Datasheet(HTML) 190 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL