RTW_ISR
isr = RTW_READ16(regs, RTW_ISR);
RTW_WRITE16(regs, RTW_ISR, isr);
RTW_WBR(regs, RTW_ISR, RTW_ISR);
RTW_WBW(regs, RTW_IMR, RTW_ISR);
RTW_WRITE16(regs, RTW_ISR, 0xffff);
RTW_SYNC(regs, RTW_IMR, RTW_ISR);