Renesas HD6417641 用户手册
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.
be initialized by the software.
• TRAPA exception register (TRA)
• Exception event register (EXPEVT)
• Interrupt event register 2 (INTEVT2)
• 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.
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
Value R/W Description
31 to 10
R Reserved
These bits are always read as 0. The write value
should always be 0.
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.
should always be 0.