Motorola MPC823e - Page 1121

Development Capabilities and Interface
20-60 MPC823e REFERENCE MANUAL MOTOROLA
DEVELOPMENT
20
CAPABILITIES & INTERFACE
20.6.4 Development Port Data Register
The special-purpose development port data register (DPDR) physically resides in the
development port logic. It is used for data interchange between the core and development
system. An access to this register is initiated using the mtspr and mfspr instructions and it
is implemented using a special bus cycle on the internal bus. For details, see Table 6-9.
DPDV—Development Port Data Value
This field contains the data to be transferred between the core and the development system.
DPIV—Development Port Instruction Value
This field is used to fetch an instruction supplied by the development system.
DPDR
BIT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FIELD DPDV
RESET —
R/W R/W
SPR 630
BIT 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
FIELD DPDV
RESET —
R/W R/W
SPR 630
NOTE: — = Undefined.
DPIR
BIT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FIELD DPIV
RESET —
R/W R
SPR 631
BIT 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
FIELD DPIV
RESET —
R/W R
SPR 631
NOTE: — = Undefined.