Epson S2R72V18 Technical Manual page 376

3. Register Details
This bit is automatically cleared once the control transfer ends (either ends normally or in error).
The control transfer can be stopped by clearing this bit while running the control transfer support
function. The CTL_SupportCmp bit is set if the control transfer ends normally in the status stage. In
all other cases, the CTL_SupportStop bit is set. Refer to CTL_SupportState for the stage in which
the control transfer stopped.
EPSON
S2R72V18 Technical Manual (Rev.1.00) 359