656
22.4.2
Reset Configuration
Table 22.4
Reset Configuration
ASDMD0
*
1
RESETP
TRST
Chip State
H
L
L
Normal reset and H-UDI reset
H
Normal reset
H
L
H-UDI reset only
H
Normal operation
L
L
L
Reset hold
*
2
H
Normal reset
H
L
H-UDI reset only
H
Normal operation
Notes:
*
1 Selects main chip mode or ASE mode
ASEMD0
= H, normal mode
ASEMD0
= L, ASE mode
Set
ASEMD0
= H when using on the user system alone, without an emulator and the
H-UDI.
*
2 In ASE mode, reset hold is enabled by driving the
RESETP
and
TRST
pins low for a
constant cycle. In this state, the CPU does not start up, even if
RESETP
is driven high.
When
TRST
is driven high, H-UDI operation is enabled, but the CPU does not start up.
The reset hold state is cancelled by the following:
•
Boot request from H-UDI
• Another
RESETP
assert (power-on reset)
22.4.3
H-UDI Reset
An H-UDI reset is executed by setting an H-UDI reset assert command in SDIR. An H-UDI reset
is of the same kind as a power-on reset. An H-UDI reset is released by inputting an H-UDI reset
negate command.
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