READ_REG
r = READ_REG(sc, TXP_A2H_0);
ier = READ_REG(sc, TXP_IER);
imr = READ_REG(sc, TXP_IMR);
r = READ_REG(sc, TXP_A2H_0);
r = READ_REG(sc, TXP_A2H_0);
r = READ_REG(sc, TXP_ISR);
r = READ_REG(sc, TXP_A2H_0);
isr = READ_REG(sc, TXP_ISR);
isr = READ_REG(sc, TXP_ISR);
r = READ_REG(sc, TXP_A2H_0);
r = READ_REG(sc, TXP_A2H_0);