Motorola MPC533 Reference Manual page 911

Table 21-13. Trap Enable Data Shifted into Development Port Shift Register
Start Mode Control
1 1 0
Table 21-14. Debug Port Command Shifted Into
Start Mode Control
1 1 1
The watchpoint trap enables and VSYNC functions are described in section Section 21.2,
"Watchpoints and Breakpoints Support" and section Section 21.1, "Program Flow
Tracking."
The debug port command function allows the development tool to either assert or negate
breakpoint requests, reset the processor, activate or deactivate the fast down-load
procedure.
21.4.6.7 Serial Data Out of Development Port — Trap Enable Mode
In trap enable mode the only response out of the development port is "sequencing error."
Data that can come out of the development port is shown in Table 21-15. "Valid data from
CPU" and "CPU interrupt" status cannot occur in trap enable mode.
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
1st 2nd 3rd
- - - - - - Instruction- - - - - -
Watchpoint Trap Enables
0 = disabled; 1 = enabled
Development Port Shift Register
Extended
Major Opcode
Opcode
x x 00000
00001
00010
0 x 00011
1 0 00011
1 1 00011
x x 00100... 11110
x 0 11111
x 1 11111
0 x 11111
1 x 11111
Chapter 21. Development Support
4th 1st 2nd
- - Data- -
Function
Hard Reset request
Soft Reset request
Reserved
End Download procedure
Start Download procedure
Reserved
Negate Maskable breakpoint.
Assert Maskable breakpoint.
Negate Non Maskable breakpoint.
Assert Non Maskable breakpoint.
Development Port
VSYNC Function
Transfer Data to
Trap Enable
Control Register
NOP
21-41