I know about TRAP #N instruction in SH4 (N between 0-255).
But is there something in SH4 like "Single Step (Trace) Exception (INT 1)" in X86 ?
To Clarify :
The single step exception occurs after every instruction if the trace bit in the flags register is equal to one. Debuggers and other programs will often set this flag so they can trace the execution of a program.
When this exception occurs, the return address on the stack is the address of the next instruction to execute. The trap handler can decode this opcode and decide how to proceed. Most debuggers use the trace exception to check for watchpoints and other events that change dynamically during program execution. Debuggers that use the trace exception for single stepping often disassemble the next instruction using the return address on the stack as a pointer to that instruction's opcode bytes.
Generally, a single step exception handler should preserve all 80x86 registers and other state information. However, you will see an interesting use of the trace exception later in this text where we will purposely modify register values to make one instruction behave like another.