Motorola ColdFire MCF5281 User Manual
Page 69
ColdFire Core
Freescale Semiconductor
2-23
ColdFire processors load hardware configuration information into the D0 and D1 general-purpose
registers after system reset. The hardware configuration information is loaded immediately after the
reset-in signal is negated. This allows an emulator to read out the contents of these registers via the BDM
to determine the hardware configuration.
Information loaded into D0 defines the processor hardware configuration as shown in
BDM: Load: 0x080 (D0)
Store: 0x180 (D0)
Access: User read-only
BDM read-only
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
PF
VER
REV
W
Reset
1
1
0
0
1
1
1
1
0
0
1
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R MAC
DIV
EMAC FPU
0
0
0
0
ISA
DEBUG
W
Reset
0
1
1
0
0
0
0
0
1
0
0
0
0
0
0
0
Figure 2-18. D0 Hardware Configuration Info
Table 2-9. D0 Hardware Configuration Info Field Description
Field
Description
31–24
PF
Processor family. This field is fixed to a hex value of 0xCF indicating a ColdFire core is present.
23–20
VER
ColdFire core version number. Defines the hardware microarchitecture version of ColdFire core.
0001 V1 ColdFire core
0010 V2 ColdFire core (This is the value used for this device.)
0011 V3 ColdFire core
0100 V4 ColdFire core
0101 V5 ColdFire core
Else Reserved for future use
19–16
REV
Processor revision number. The default is 0b0000.
15
MAC
MAC present. This bit signals if the optional multiply-accumulate (MAC) execution engine is present in processor core.
0 MAC execute engine not present in core. (This is the value used for this device.)
1 MAC execute engine is present in core.
14
DIV
Divide present. This bit signals if the hardware divider (DIV) is present in the processor core.
0 Divide execute engine not present in core.
1 Divide execute engine is present in core.
13
EMAC
EMAC present. This bit signals if the optional enhanced multiply-accumulate (EMAC) execution engine is present in
processor core.
0 EMAC execute engine not present in core.
1 EMAC execute engine is present in core. (This is the value used for this device.)
12
FPU
FPU present. This bit signals if the optional floating-point (FPU) execution engine is present in processor core.
0 FPU execute engine not present in core. (This is the value used for this device.)
1 FPU execute engine is present in core.
(This is the value used for this device.)
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3