Section 5
Exception Handling
Rev. 0.50 May 18, 2006 Page 105 of 1588
REJ09B0313-0050
5.2 Resets
5.2.1 Input/Output
Pins
Table 5.5 shows the reset-related pin configuration.
Table 5.5
Pin Configuration
Pin Name
Symbol
I/O
Function
Power-on reset
RES
Input
When this pin is driven low, this LSI shifts to the power-
on reset processing
Manual reset
MRES
Input
When this pin is driven low, this LSI shifts to the manual
reset processing.
5.2.2
Types of Reset
A reset is the highest-priority exception handling source. There are two kinds of reset, power-on
and manual. As shown in table 5.6, the CPU state is initialized in both a power-on reset and a
manual reset. The FPU state is initialized by a power-on reset, but not by a manual reset. On-chip
peripheral module registers except a few registers are also initialized by a power-on reset, but not
by a manual reset.
Table 5.6
Reset States
Conditions for Transition to Reset State
Internal States
Type
RES
H-UDI
Command
MRES
WDT Overflow
CPU
Other Modules
Low —
—
—
Initialized
Initialized
High
H-UDI reset assert
command is set
— —
Initialized
Initialized
Power-on
reset
High Command
other
than H-UDI reset
assert is set
— Power-on
reset
Initialized
*
High Command
other
than H-UDI reset
assert is set
Low —
Initialized
*
Manual
reset
High Command
other
than H-UDI reset
assert is set
High Manual
reset Initialized
*
Note:
*
See section 30.3, Register States in Each Operating Mode.
Содержание Single-Chip Microcomputer SH7203
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