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Section 9 Exception Handling
Rev. 4.00 Sep. 14, 2005 Page 198 of 982
REJ09B0023-0400
9.1 Register Descriptions
There are three registers for exception handling. A register with an undefined initial value should
be initialized by the software.
• TRAPA exception register (TRA)
• Exception event register (EXPEVT)
• Interrupt event register 2 (INTEVT2)
Figure 9.1 shows the bit configuration of each register.
31
TRA
EXPEVT
INTEVT2
TRA
EXPEVT
INTEVT2
10 9 2 1 0
31 12 11 0
0
0
0
0
31 12 11 0
Figure 9.1 Register Bit Configuration
9.1.1 TRAPA Exception Register (TRA)
TRA is assigned to address H'FFFFFFD0 and consists of the 8-bit immediate data (imm) of the
TRAPA instruction. TRA is automatically specified by the hardware when the TRAPA instruction
is executed. Only bits 9 to 2 of the TRA can be re-written using the software.
Bit Bit Name
Initial
Value R/W Description
31 to 10 R Reserved
These bits are always read as 0. The write value
should always be 0.
9 to 2 TRA R/W 8-Bit Immediate Data
1, 0 R Reserved
These bits are always read as 0. The write value
should always be 0.