MODE_SHDN
opmode = MODE_SHDN;
opmode = MODE_SHDN;
opmode = MODE_SHDN;
opmode = MODE_SHDN;
case MODE_SHDN:
REG_ENABLE, 0x03, MODE_SHDN);
if (rval < 0 || ((reg_val & MASK_ENABLE) != MODE_SHDN))
REG_ENABLE, flash->mode_reg | MODE_SHDN);