Datasheet

Chapter 5. Debug Support 5-49
Motorola-Recommended BDM Pinout
Breakpoint registers must be carefully configured in a development system if the processor
is executing. The debug module contains no hardware interlocks, so TDR and XTDR
should be disabled while breakpoint registers are loaded, after which TDR and XTDR can
be written to define the exact trigger. This prevents spurious breakpoint triggers.
Because there are no hardware interlocks in the debug unit, no BDM operations are allowed
while the CPU is writing the debug’s registers (DSCLK must be inactive).
5.7 Motorola-Recommended BDM Pinout
The ColdFire BDM connector, Figure 5-46, is a 26-pin Berg connector arranged 2 x 13.
Figure 5-46. Recommended BDM Connector
5.8 Debug C Definition of PSTDDATA Outputs
This section specifies the ColdFire processor and debug module’s generation of the
PSTDDATA output on an instruction basis. In general, the PSTDDATA output for an
instruction is defined as PSTDDATA = 1, {[89B], operand} where the {...} definition is
optional operand information defined by the setting of the CSR. The [89B] signifies a PST
value that is a marker identifying the presence and size of valid data to follow. A PST value
of 0x8 (1 byte of data), 0x9 (2 bytes), or 0xB (4 bytes) is displayed before the data output.
The CSR allows operands to be displayed based on reference type (read, write, or both). A
PST value {0x8, 0x9, or 0xB} identifies the size and presence of valid data to follow on the
PSTDDATA output {1, 2, or 4 bytes}. Additionally, for certain change-of-flow branch
instructions, CSR[9,8] provides the ability to display {0x2, 0x3, or 0x4} bytes of the target
instruction address. A PST value {0x9, 0xA, or 0xB} provides the marker identifying the
size and presence of a valid target address on the PSTDDATA output.
1
3
5
7
9
11
13
15
17
19
21
23
25
2
4
6
8
10
12
14
16
18
20
22
24
26
Developer reserved
1
GND
GND
RESET
+3.3V
2
GND
PSTDDATA6
PSTDDATA4
PSTDDATA2
PSTDDATA0
Motorola reserved
GND
VDD_CPU
BKPT
DSCLK
Developer reserved
1
DSI
DSO
PSTDDATA7
PSTDDATA5
PSTDDATA3
PSTDDATA1
GND
Motorola reserved
PSTCLK
TA
1
Pins reserved for BDM developer use.
2
Supplied by target.