HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 107
HD6417618
Manufacturer Part Number
HD6417618
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417618.pdf
(646 pages)
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5.5.3
An instruction placed immediately after a delayed branch instruction is called “instruction placed
in a delay slot”. When the instruction placed in the delay slot is an undefined code, illegal slot
exception handling starts after the undefined code is decoded. Illegal slot exception handling also
starts when an instruction that changes the program counter (PC) value is placed in a delay slot
and the instruction is decoded. The CPU handles an illegal slot instruction as follows:
1. The status register (SR) is saved to the stack.
2. The program counter (PC) is saved to the stack. The PC value saved is the target address of the
3. The start address of the exception handling routine is fetched from the exception handling
5.5.4
When an undefined code placed anywhere other than immediately after a delayed branch
instruction (i.e., in a delay slot) is decoded, general illegal instruction exception handling starts.
The CPU handles the general illegal instructions in the same procedures as in the illegal slot
instructions. Unlike processing of illegal slot instructions, however, the program counter value that
is stacked is the start address of the undefined code.
delayed branch instruction immediately before the undefined code or the instruction that
rewrites the PC.
vector table that corresponds to the exception that occurred. Program execution branches to
that address and the program starts. This branch is not a delayed branch.
Illegal Slot Instructions
General Illegal Instructions
Rev. 6.00 Jun. 12, 2007 Page 75 of 610
Section 5 Exception Handling
REJ09B0131-0600
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