Technical Reference Manual
002-29852 Rev. *B
Bits Name
SW
HW
Default or
Enum
Description
3
TXENA
RW
R
0
Enables forwarding of hardware event packet from the
DWT unit to the ITM for output to the TPIU:
0 Disabled.
1 Enabled.
It is IMPLEMENTATION DEFINED whether the DWT
discards packets that it cannot forward to the ITM.
Note: If a debugger changes this bit from 0 to 1, the
DWT might forward a hardware event packet that it
has previously generated.
A Power-on reset clears this bit to 0.
4
SWOENA
RW
R
0
Enables asynchronous clocking of the timestamp
counter:
0 Timestamp counter uses the processor system
clock.
1 Timestamp counter uses asynchronous clock from
the TPIU interface. The timestamp counter is held in
reset while the output line is idle.
Which clocking modes are implemented is
IMPLEMENTATION DEFINED. If the implementation
does not support both modes this bit is either RAZ or
RAO, to indicate the implemented mode.
When this is a RW bit, on a Power-on reset, the value
of this bit is UNKNOWN
8:9
TSPRESCALE
RW
R
0
Local timestamp prescaler, used with the trace packet
reference clock. The possible values are:
00 No prescaling.
01 Divide by 4.
10 Divide by 16.
11 Divide by 64.
If implemented, a Power-on reset clears this field to
zero.
If the processor does not implement the timestamp
prescaler then these bits are reserved, RAZ/WI.
10:11 GTSFREQ
RW
R
0
Global timestamp frequency. Defines how often the
ITM generates a global timestamp, based on the
global timestamp clock frequency, or disables
generation of global timestamps. The possible values
are:
00 Disable generation of global timestamps.
01 Generate timestamp request whenever the ITM
detects a change in global
timestamp counter bits[47:7]. This is approximately
every 128 cycles.
10 Generate timestamp request whenever the ITM
detects a change in global timestamp counter
bits[47:13]. This is approximately every 8192 cycles.
11 Generate a timestamp after every packet, if the
output FIFO is empty.
For more information see Global timestamping on Arm
TRM page C1-771.
A Power-on reset clears this field to zero.
If the implementation does not support global
timestamping then these bits are reserved, RAZ/WI.
16:22 TRACEBUSID
RW
R
0
Identifier for multi-source trace stream formatting. If
multi-source trace is in use, the debugger must write a
non-zero value to this field. For more information see
CoreSight requirements for the TraceBusID field on
TRM page C1-778.
On a Power-on reset, the value of this field is
UNKNOWN.
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2022-04-18
TRAVEO™ T2G Automotive MCU: TVII-B-E-4M body controller entry registers