Section 5 Exception Handling
Rev.1.00 Dec. 13, 2005 Page 108 of 1286
REJ09B0158-0100
5.6
Description of Exceptions
The various exception handling operations explained here are exception sources, transition address
on the occurrence of exception, and processor operation when a transition is made.
5.6.1 Resets
Power-On Reset:
•
Condition:
Power-on reset request
•
Operations:
Exception code H'000 is set in EXPEVT, initialization of the CPU and on-chip peripheral
module is carried out, and then a branch is made to the reset vector (H'A0000000). For details,
see the register descriptions in the relevant sections. A power-on reset should be executed
when power is supplied.
Manual Reset:
•
Condition:
Manual reset request
•
Operations:
Exception code H'020 is set in EXPEVT, initialization of the CPU and on-chip peripheral
module is carried out, and then a branch is made to the branch vector (H'A0000000). The
registers initialized by a power-on reset and manual reset are different. For details, see the
register descriptions in the relevant sections.
H-UDI Reset:
•
Source: SDIR.TI[7:4] = B'0110 (negation) or B'0111 (assertion)
•
Transition address: H'A0000000
•
Transition operations:
Exception code H'000 is set in EXPEVT, initialization of VBR and SR is performed, and a
branch is made to PC = H'A0000000.
CPU and on-chip peripheral module initialization is performed. For details, see the register
descriptions in the relevant sections.
Содержание SH7780 Series
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