mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 147
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mcf5307cft90b
Manufacturer Part Number
mcf5307cft90b
Description
Mcf5307 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5307CFT90B.pdf
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5.5.2.1 Receive Packet Format
The basic receive packet, Figure 5-14, consists of 16 data bits and 1 status bit.
Table 5-15 describes receive BDM packet fields.
5.5.2.2 Transmit Packet Format
The basic transmit packet, Figure 5-15, consists of 16 data bits and 1 control bit.
Table 5-16 describes transmit BDM packet fields.
5.5.3 BDM Command Set
Table 5-17 summarizes the BDM command set. Subsequent paragraphs contain detailed
descriptions of each command. Issuing a BDM command when the processor is accessing
debug module registers using the WDEBUG instruction causes undefined behavior.
16
15–0 Data
Bits
16
15–0 Data
Bits
16
S
16
C
S
Name
C
Name
15
15
Control. This bit is reserved. Command and data transfers initiated by the development system
should clear C.
Contains the data to be sent from the development system to the debug module.
Status. Indicates the status of CPU-generated messages listed below. The not-ready response can
be ignored unless a memory-referencing cycle is in progress. Otherwise, the debug module can
accept a new serial transfer after 32 processor clock periods.
S
0
0
1
1
1
response message is always a single word, with the data field encoded as shown above.
Data. Contains the message to be sent from the debug module to the development system. The
Data
xxxx
0xFFFF
0x0000
0x0001
0xFFFF
Table 5-16. Transmit BDM Packet Field Description
Table 5-15. Receive BDM Packet Field Description
Freescale Semiconductor, Inc.
Message
Valid data transfer
Status OK
Not ready with response; come again
Error—Terminated bus cycle; data invalid
Illegal command
For More Information On This Product,
Figure 5-15. Transmit BDM Packet
Figure 5-14. Receive BDM Packet
Chapter 5. Debug Support
Go to: www.freescale.com
Data Field [15:0]
D[15:0]
Description
Description
Background Debug Mode (BDM)
5-19
0
0
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