MACCFG1_RX_EN
tmp |= MACCFG1_RX_EN | MACCFG1_TX_EN;
tmp &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
tempval &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
tempval |= (MACCFG1_RX_EN | MACCFG1_TX_EN);
tempval |= MACCFG1_RX_EN;
tempval |= MACCFG1_RX_EN;