Section 2 CPU
Rev. 3.00 Mar. 14, 2006 Page 26 of 804
REJ09B0104-0300
H'00000000
H'00000003
H'00000004
Exception vector table
Reset exception vector
H'00000007
H'00000001
H'00000002
H'00000005
H'00000006
Figure 2.6 Exception Vector Table (Maximum Modes)
The memory indirect (@@aa:8) and extended memory indirect (@@vec:7) addressing modes
are used in the JMP and JSR instructions. An 8-bit absolute address included in the instruction
code specifies a memory location. Execution branches to the contents of the memory location.
In maximum mode, an operand is a 32-bit (longword) operand, providing a 32-bit branch
address.
•
Stack Structure
The stack structure of PC at a subroutine branch and that of PC and CCR at an exception
handling are shown in figure 2.7. The PC contents are saved or restored in 32-bit units. The
EXR contents are saved or restored regardless of whether or not EXR is in use.
(a) Subroutine Branch
(b) Exception Handling
PC
(32 bits)
EXR
CCR
PC
(32 bits)
SP
SP
Figure 2.7 Stack Structure (Maximum Mode)
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