dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 215

• Manufacturer Part Number: dsp56000
• Description: 24-bit Digital Signal Processor Family Manual
• Manufacturer: Freescale Semiconductor, Inc

10.11.4 Executing a Single-Word DSP56K Instruction While in Debug Mode
10.11.5 Executing a Two-Word DSP56K Instruction While in Debug Mode
10.11.6 Returning from Debug Mode to Normal Mode
There are two cases for returning from the debug mode in a single processor:
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1. Send command WRITE PDB REGISTER, GO, no EX (01001001).
2. ACK
3. Send the single-word 24-bit DSP56K opcode to be executed.
4. ACK
1. Send command WRITE PDB REGISTER, no GO, no EX (00001001).
2. ACK
3. Send the first instruction word (24-bit DSP56K opcode)
4. ACK
5. Send command WRITE PDB REGISTER, GO, no EX (01001001)
6. ACK
7. Send the second 24-bit instruction word.
8. ACK
Control is returned to the program that was running before debug was initiated.
Jump to a different program location is executed.
The OnCE controller selects PDB as destination for serial data.
After 24 bits have been received, the PDB register drives the PDB. The OnCE con-
troller releases the chip from the debug mode and the chip executes the instruction.
The signal that marks the end of the instruction returns the chip to the debug mode.
Some DSP56K instructions should not be executed in this state: DO, REP, ILLE-
GAL or any opcode that is considered illegal, and DEBUG.
After 24 bits have been received, the PDB register drives the PDB. The OnCE con-
troller causes the processor to load the opcode.
Some DSP56K instructions should not be executed in this state: DO, REP, ILLE-
GAL or any opcode that is considered illegal, and DEBUG.
The OnCE controller selects PDB as destination for serial data.
After 24 bits have been received, the PDB register drives the PDB. The OnCE con-
troller releases the chip from the debug mode and the instruction starts execution.
The signal that marks the end of the instruction returns the chip to the debug mode.
The OnCE controller selects PDB as destination for serial data.
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