// testing some more complicated defines


#define max3420e_enable()       \
        spi_enable(MAX3420E_EnMask)

#define max3420e_disable()      \
        spi_disable(MAX3420E_EnMask)

#define wrac(reg)               \
        pha                     :\
        max3420e_enable()       :\
        lda #(reg) | 0x02       :\
        spi_wra()               :\
        pla                     :\
        spi_wra()               :\
        max3420e_disable()

// just the definition of this macro hangs the xa indefinitely...

#define CLRBIT(reg, val)        \
        rreg(reg)               :\
        and #255-val            :\
        wrac(reg)