Renesas Stereo System SH7709S User Manual
Rev. 5.00, 09/03, page 652 of 760
22.4.2
Reset Configuration
Table 22.4
Reset Configuration
ASE
ASE
ASE
ASEM
M
M
MD
D
D
D0000*
1
R
R
R
RESE
ESE
ESE
ESET
TT
TP
P
P
P
T
TT
TR
R
R
RS
S
S
ST
TT
T
Chip State
High-level
Low-level
Low-level
Normal reset and UDI reset
High-level
Normal reset
High-level
Low-level
UDI reset only
High-level
Normal operation
Low-level
Low-level
Low-level
Reset hold
*
2
High-level
ASE user mode
*
3
: Normal reset
ASE break mode
*
3
:
RESETP
assertion
masked
High-level
Low-level
UDI reset only
High-level
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
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, UDI operation is enabled, but the CPU does not start up.
The reset hold state is cancelled by the following:
•
Boot request from UDI
• Another
RESETP
assert (power-on reset)
3. There are two ASE modes, one for executing software in the emulator’s firmware (ASE
break mode) and one for executing user software (ASE user mode).