MASK_IEPC
chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
chip->control_mask = MASK_IEPC | MASK_IEE | 0x11; /* default */
chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */