Selecting Device Operating Modes By Using Trst, Emu0, And Emu1 - Texas Instruments TMS320C28x Reference Manual

Table 7−2. Selecting Device Operating Modes By Using TRST, EMU0, and EMU1
TRST EMU1
Low Low
Low Low
Low High
Low High
High Low or High
EMU0 Device Operating Mode
Low Slave mode. Disables the CPU and
memory portions of the C28x.
Another processor treats the C28x
as a peripheral.
High Reserved for testing
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.
High Normal mode with emulation dis-
abled. This is the setting that should
be used on target systems when a
scan
XDS510) is not attached. TRST will
be pulled down and EMU1 and
EMU0 pulled up within the C28x;
this is the default mode.
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.
controller (such as
Emulation Features
Debug Interface
JTAG Cable
Active?
No
No
Yes
No
the
Yes
7-5