Motorola MPC823e - Page 1097

Development Capabilities and Interface
20-36 MPC823e REFERENCE MANUAL MOTOROLA
DEVELOPMENT
20
CAPABILITIES & INTERFACE
The watchpoint trap enable and VSYNC functions are described in
Section 20.3 Generating Watchpoints And Breakpoints and Section 20.2 Program
Flow Tracking. The DEBUG PORT command allows the development tool to either assert
or negate breakpoint requests, reset the processor, or activate or deactivate the fast
download procedure. Status out of the development interface port in the trap enable mode
is shown in Table 20-10.
Table 20-8. Trap Enable Data Shifted Into DPS Register
START MODE CONTROL FIRST SECOND THIRD FOURTH FIRST SECOND VSYNC FUNCTION
INSTRUCTION WATCHPOINT
TRAP ENABLES
DATA WATCHPOINT
TRAP ENABLES
1 1 0 0 = Disabled
1 = Enabled
Transfer Data to
Trap Enable Control
Register
Table 20-9. DEBUG PORT Command Shifted Into the DPS Register
START MODE CONTROL EXTENDED
OPCODE
MAJOR OPCODE FUNCTION
1 1 1 x x 00000 NOP
00001 Hard Reset Request
00010 Soft Reset Request
0 x 00011 Reserved
1 0 00011 End Download Procedure
1 1 00011 Start Download Procedure
x x 00100 — 11110 Reserved
x 0 11111 Negate Maskable Breakpoint
x 1 11111 Assert Maskable Breakpoint
0 x 11111 Negate Nonmaskable Breakpoint
1 x 11111 Assert Nonmaskable Breakpoint