C. Serial Communication Interface (SCI)
1. SCI control register zero (SCCR0)
a. Write a transfer rate (baud) value into the BR field.
2. SCI control register one (SCCR1)
a. Select serial mode (M)
b. Enable use (PE) and type (PT) of parity check.
c. Select use (RWU) and type (WAKE) of receiver wakeup.
d. Enable idle-line detection (ILT) and interrupt (ILIE).
e. Enable or disable wired-OR operation (WOMS).
f. Enable or disable break transmission (BK).
3. To receive
a. Set the receiver (RE) and receiver interrupt (RIE) bits in SCCR1.
4. To transmit
a. Set transmitter (TE) and transmitter interrupt (TIE).
b. Clear the transmitter data register empty (TDRE) and transmit complete
(TC) indicators by reading the serial communication interface status reg-
ister (SCSR).
c. Write transmit data to the serial communication data register (SCDR).
6
MOTOROLA
6-32
QUEUED SERIAL MODULE
MC68331
USER’S MANUAL
MOTOROLA [ MOTOROLA ]
