VR_CR0_RX_ON
VR_CR0_START | VR_CR0_TX_ON | VR_CR0_RX_ON | VR_CR0_RX_GO);
if ((cmd & VR_CR0_RX_ON) == 0) {
cmd |= VR_CR0_RX_ON;
if ((cmd & VR_CR0_RX_ON) != 0) {
cmd &= ~VR_CR0_RX_ON;
if ((cmd & VR_CR0_RX_ON) == 0)
if ((cr0 & (VR_CR0_TX_ON | VR_CR0_RX_ON)) != 0) {