/* Set the S and M flags and change the active stack pointer.
* Note that value MUST be 0, 2, 4, or 6 (bit2 = S, bit1 = M).
*/
/* Set the S and M flags and change the active stack pointer.
* Note that value MUST be 0, 2, 4, or 6 (bit2 = S, bit1 = M).
*/