S+, S - (Set Source/Assembly Mode) 

Syntax

S+
S -

Description

Use these commands to switch between source mode (where the debugger steps line-by-line through the source code) and assembly-language mode (where the debugger steps instruction-by-instruction). The S+ command switches to Source mode, and S -  switches to assembly-language mode. The status bar displays whether the current mode is SRC or ASM.