H8SSLASH2225 datasheet(154/1071 Pages) RENESAS

154 / 1071 page

Section 2 CPU

Rev. 5.00 Aug 08, 2006 page 68 of 982

REJ09B0054-0500

• Instruction Set

All instructions and addressing modes can be used.

• Exception Vector Table and Memory Indirect Branch Addresses

In advanced mode, the top area starting at H'00000000 is allocated to the exception vector

table in units of 32 bits. In each 32 bits, the upper 8 bits are ignored and a branch address is

stored in the lower 24 bits (figure 2.3). For details of the exception vector table, see section 4,

Exception Handling.

H'00000000

H'00000003

H'00000004

H'0000000B

H'0000000C

H'00000010

H'00000008

H'00000007

Reserved

Reset exception vector

(Reserved for system use)

Exception vector table

Exception vector 1

Figure 2.3 Exception Vector Table (Advanced Mode)

The memory indirect addressing mode (@@aa:8) employed in the JMP and JSR instructions

uses an 8-bit absolute address included in the instruction code to specify a memory operand

that contains a branch address. In advanced mode, the operand is a 32-bit longword operand,

providing a 32-bit branch address. The upper 8 bits of these 32 bits is a reserved area that is

regarded as H'00. Branch addresses can be stored in the area from H'00000000 to H'000000FF.

Note that the first part of this range is also the exception vector table.

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