23-12
MPC565/MPC566 Reference Manual
MOTOROLA
Programming Model
23.2.1.5 RCPU Development Access Modes
Table 23-9 describes the allowed modes for RCPU development access.
Table 23-8. READI_DC Bit Descriptions
RCPU
Bit(s)
Nexus
Bit(s)
Name
Description
07
DOR 1
1 The DOR, DME, and DPA fields in the DC register can only be modified when system reset is asserted, or reset (to
default state) when the READI module is reset by the assertion of RSTI.
READI Debug Mode Entry Out-of-reset Field can be configured to enable or disable
debug mode entry out of reset.
0 Debug Mode Not Entered Out-of-Reset
1 Debug Mode Entered Out-of-Reset
16
DME1
READI Debug Mode Enable Field can be configured to enable or disable debug mode.
0 Debug Mode Disabled
1 Debug Mode Enabled
25
DPA1
READI RCPU Development Access Field can be configured to access the RCPU
Developmentfeatures via theREADI moduleorvia thedebugpins (TCK_DSCK,
TDI_DSDI and TDO_DSDO). The default DPA setting configures the RCPU
development features to be accessed via debug pins.
0 RCPU Development Access Disabled through READI, BDM pins enabled
1 RCPU Development Access Enabled through READI
3:5
4:2
TM
READI Trace Mode Field can be configured to enable BTM, DTM and OTM. Any or all
types of trace may be enabled.
000 No Trace
1xx BTM Branch Trace Messaging Enabled
x1x DTM Data Trace Messaging Enabled
xx1 OTM Ownership Trace Messaging Enabled
6:7
1:0
EC
READI EVTI Control Field can be configured for synchronization and breakpoint
generation. If the EC is equal to 0b00, asserting EVTI will cause the next program and
data trace message to be a synchronization message (providing program and data
trace are enabled). If the EC field is equal to 0b01, a breakpoint will be generated. If
the field is configured to one of the reserved states, its action reverts to that of the
default state.
NOTE: The EVTI pin is level sensitive when EC is configured for breakpoint
generation. This implies that as long as EVTI assertion is continued (with EC set to
0b01), the READI module will continue requesting a breakpoint. The user must detect
breakpoint generation and negate the EVTI pin appropriately.
00 EVTI for program and data trace synchronization
01 EVTI for breakpoint generation
1x No Action
Table 23-9. RCPU Development Access Modes
DOR
DME
DPA
RCPU Development Access through READI
x
0
No RCPU Development Access via READI. RCPU access is done through
BDM pins.
x
0
1
Non-debug mode access of RCPU development through READI.