Specifications

SCI Module Registers
8-21 Serial Communications Interface (SCI)
Bit 3 ADDR/IDLE MODE. SCI multiprocessor mode control bit.
This bit selects one of the multiprocessor protocols
0 Idle-line mode protocol selected
1 Address-bit mode protocol selected
Multiprocessor communication is different from the other communication
modes because it uses SLEEP and TXWAKE functions (bits SCICTL1.2 and
SCICTL1.3, respectively). The idle-line mode is usually used for normal com-
munications because the address-bit mode adds an extra bit to the frame. The
Idle-line mode does not add this extra bit and is compatible with RS-232 type
communications.
Bits 2–0 SCI CHAR2–0. Character-length control bits 2 - 0.
These bits select the SCI character length from one to eight bits. Characters
of less than eight bits are right-justified in SCIRXBUF and SCIRXEMU and are
padded with leading zeros in SCIRXBUF. SCITXBUF
doesn’t need to be
padded with leading zeros. Table 8–4 lists the bit values and character lengths
for SCI CHAR2-0 bits.
Table 8–4. SCI CHAR2–0 Bit Values and Character Lengths
SCI CHAR2–0 Bit Values (Binary)
SCI CHAR2 SCI CHAR1 SCI CHAR0
Character Length (Bits)
0 0 0 1
0 0 1 2
010 3
0 1 1 4
100 5
1 0 1 6
110 7
1 1 1 8