Debug Interface
7-5Emulation Features
Table 7−2. Selecting Device Operating Modes By Using TRST, EMU0, and EMU1
TRST EMU1 EMU0 Device Operating Mode
JTAG Cable
Active?
Low Low Low Slave mode. Disables the CPU and
memory portions of the C28x.
Another processor treats the C28x
as a peripheral.
No
Low Low High Reserved for testing No
Low High Low Wait-in-reset mode. Prolongs the
device’s reset until released by ex-
ternal means. This allows a C28x to
power up in reset, provided external
hardware holds EMU0 low only
while power-up reset is active.
Yes
Low High High Normal mode with emulation dis-
abled. This is the setting that should
be used on target systems when a
scan controller (such as the
XDS510) is not attached. TRST
will
be pulled down and EMU1 and
EMU0 pulled up within the C28x;
this is the default mode.
No
High
Low or High Low or High Normal mode with emulation en-
abled. This is the setting to use on
target systems when a scan control-
ler is attached (the scan controller
will control TRST
). TRST should not
be high during device power-up.
Yes
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