Trace Pin Assignment; Table 249. Asynchronous Trace Pin Assignment; Table 250. Synchronous Trace Pin Assignment - ST STM32F446 Series Reference Manual

RM0390
33.17.2

TRACE pin assignment

•
Asynchronous mode
The asynchronous mode requires 1 extra pin and is available on all packages. It is only
available if using Serial Wire mode (not in JTAG mode).
TRACESWO
1. Refer to the Alternate function mapping table in the datasheet
•
Synchronous mode
The synchronous mode requires from 2 to 6 extra pins depending on the data trace
size and is only available in the larger packages. In addition it is available in JTAG
mode and in Serial Wire mode and provides better bandwidth output capabilities than
asynchronous trace.
TRACECK
TRACED[3:0]
1. Refer to the Alternate function mapping table in the datasheet
TPUI TRACE pin assignment
By default, these pins are NOT assigned. They can be assigned by setting the
TRACE_IOEN and TRACE_MODE bits in the
configuration has to be done by the debugger host.
In addition, the number of pins to assign depends on the trace configuration (asynchronous
or synchronous).
•
Asynchronous mode: 1 extra pin is needed
•
Synchronous mode: from 2 to 5 extra pins are needed depending on the size of the
data trace port register (1, 2 or 4):
–
–
–
–
–
To assign the TRACE pin, the debugger host must program the bits TRACE_IOEN and
TRACE_MODE[1:0] of the Debug MCU configuration Register (DBGMCU_CR). By default
the TRACE pins are not assigned.

Table 249. Asynchronous TRACE pin assignment

TPUI pin name

Table 250. Synchronous TRACE pin assignment

TPUI pin name
TRACECK
TRACED(0) if port size is configured to 1, 2 or 4
TRACED(1) if port size is configured to 2 or 4
TRACED(2) if port size is configured to 4
TRACED(3) if port size is configured to 4
Trace synchronous mode
Type
O TRACE Async Data Output
Trace synchronous mode
Type
O TRACE Clock
TRACE Sync Data Outputs
O
Can be 1, 2 or 4.
Debug MCU configuration
RM0390 Rev 4
Debug support (DBG)
Description
(1)
Description
(1)
(1)
register. This
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