RIIC_ICSR2
riic_writeb(riic, 0, RIIC_ICSR2);
if (riic_readb(riic, RIIC_ICSR2) & ICSR2_NACKF) {
riic_clear_set_bit(riic, ICSR2_NACKF, 0, RIIC_ICSR2);
riic_writeb(riic, 0, RIIC_ICSR2);
riic_readb(riic, RIIC_ICSR2);
u8 icsr2 = riic_readb(data, RIIC_ICSR2);
[RIIC_ICSR2] = 0x24,
[RIIC_ICSR2] = 0x09,