dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 216

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

10.11.6.1
10.11.6.2
MOTOROLA
1. Send command WRITE PDB REGISTER, no GO, no EX (00001001)
2. ACK
3. Send the 24 bits of the saved PIL (instruction latch) value.
4. ACK
5. Send command WRITE PDB REGISTER, GO, EX (01101001)
6. ACK
7. Send the 24 bits of the saved PDB value.
1. Send command WRITE PDB REGISTER, no GO, no EX (00001001)
2. ACK
3. Send 24 bits of the opcode of a two-word jump instruction instead of the saved PIL
4. ACK
5. Send command WRITE PDB REGISTER, GO, EX (01101001)
6. ACK
7. Send 24 bits of the jump target absolute address ($xxxxxx).
The OnCE controller selects the PDB as the destination for serial data. Also, the
OnCE controller selects the on-chip PAB register as the source for the PAB bus.
After the 24 bits have been received, the PDB register drives the PDB. The OnCE
controller causes the PIL to latch the PDB value. In this way, the PIL is restored to
the same state as before entering the debug mode.
The OnCE controller selects PDB as destination for the serial data to follow.
After the 24 bits have been received, the PDB register drives the PDB. In this way,
the PDB is restored to the same state as before entering the debug mode. The EX
bit causes the OnCE controller to release the chip from the debug mode and the
status bits in OSCR are cleared. The GO bit causes the chip to start executing
instructions.
The OnCE controller selects PDB as destination for serial data. Also, the OnCE
controller selects the on-chip PAB register as the source for the PAB bus.
value. After the 24 bits have been received, the PDB register drives the PDB. The
OnCE controller causes the PIL to latch the PDB value. In this way, the instruction
latch will contain the opcode of the jump instruction which will cause the change in
the program flow.
The OnCE controller selects PDB as destination for serial data.
After 24 bits have been received, the PDB register drives the PDB. In this way, the
PDB contains the second word of the jump as required for the jump instruction ex-
Case 1: Return To The Previous Program (Return To Normal Mode)
Case 2: Jump To A New Program (Go From Address $xxxx)
Freescale Semiconductor, Inc.
For More Information On This Product,
ON-CHIP EMULATION (OnCE)
Go to: www.freescale.com
USING THE OnCE
10 - 27