Rev. 2.00, 09/03, page 579 of 690
23.4.2
Reset Configuration
Table 23.4
Reset Configuration
ASEMD0*
1
RESETP
TRST
Chip State
H
L
L
Normal reset and UDI reset
*
4
H
Normal reset
*
4
H
L
UDI reset only
H
Normal operation
L
L
L
Reset hold
*
2
H
In ASE user mode
*
3
: Normal reset
In ASE break mode
*
3
:
RESETP
assert is
masked
H
L
UDI reset only
H
Normal operation
Notes: 1. Performs normal mode and ASE mode settings
ASEMD0
= H, normal mode
ASEMD0
= L, ASE mode
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, UDI operation is enabled, but the CPU does not start up.
The reset hold state is canceled by the following:
• Another
RESETP
assert (power-on reset)
•
TRST
reassert
3. ASE mode is classified into two modes; ASE break mode to execute the firm program
of an emulator and ASE user mode to execute the user program.
4. Make sure the
TRST
pin is low when the power is turned on.
23.4.3
TDO Output Timing
The timing of data output from the TDO is switched by the command type set in the SDIR. The
timing changes at the TCK falling edge when JTAG commands (EXTEST, CLAMP, HIGHZ,
SAMPLE/PRELOAD, IDCODE, and BYPASS) are set. This is a timing of the JTAG standard.
When the UDI commands (UDI reset negate, UDI reset assert, and UDI interrupt) are set, TDO is
output at the TCK rising edge earlier than the JTAG standard by a half cycle.
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