CCR1
rsci_serial_out(port, CCR1, rsci_serial_in(port, CCR1) |
rsci_serial_out(port, CCR1, ccr1_val);
rsci_serial_out(port, CCR1, rsci_serial_in(port, CCR1) | CCR1_SPLP);
ccr1_val = rsci_serial_in(port, CCR1);
rsci_serial_out(port, CCR1, ccr1_val);