MC68340 datasheet(205/441 Pages) FREESCALE

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5- 68

MC68340 USER’S MANUAL

MOTOROLA

executing at completion of the bus cycle. PCC will contain $00000001 if BDM is entered

via a double bus fault immediately out of reset.

YES

CONTINUE

ENTER (BDM)

• ASSERT FREEZE SIGNAL

• WAIT FOR COMMAND

SEND INITIAL COMMAND

• LOAD COMMAND REGISTER

• ENABLE SHIFT CLOCK

• SHIFT OUT 17 BITS

• DISABLE SHIFT CLOCK

EXECUTE COMMAND

• LOAD: NOT READY/ RESPONSE

• PERFORM COMMAND

• STORE RESULTS

READ RESULTS/NEW COMMAND

• LOAD COMMAND REGISTER

• ENABLE SHIFT CLOCK

• SHIFT IN/OUT 17 BITS

• DISABLE SHIFT CLOCK

• READ RESULT REGISTER

IF RESULTS =

"NOT READY"

CPU32 ACTIVITY

DEVELOPMENT SYSTEM ACTIVITY

Figure 5-21. BDM Command Execution Flowchart

5.6.2.6 RETURNING FROM BDM. BDM is terminated when a resume execution (GO) or

call user code (CALL) command is received. Both GO and CALL flush the instruction

pipeline and prefetch instructions from the location pointed to by the RPC.

The return PC and the memory space referred to by the SR SUPV bit reflect any changes

made during BDM. FREEZE is negated prior to initiating the first prefetch. Upon negation

of FREEZE, the serial subsystem is disabled, and the signals revert to

IPIPE and IFETCH

functionality.

5.6.2.7 SERIAL INTERFACE. Communication with the CPU32 during BDM occurs via a

dedicated serial interface, which shares pins with other development features. The

BKPT

signal becomes the DSCLK; DSI is received on

IFETCH, and DSO is transmitted on

IPIPE.

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