
Serial Communications Interface (SCI)
Functional Description
68HC908AZ32A — Rev 0.0
Advance Information
MOTOROLA
Serial Communications Interface (SCI)
215
16.5.2.3 Break Characters
Writing a logic 1 to the send break bit, SBK, in SCC2 loads the transmit
shift register with a break character. A break character contains all logic
0s and has no start, stop, or parity bit. Break character length depends
on the M bit in SCC1. As long as SBK is at logic 1, transmitter logic
Register Name
Bit 7
654321
Bit 0
SCI Control Register 1 (SCC1)
Read:
LOOPS
ENSCI
TXINV
M
WAKE
ILTY
PEN
PTY
Write:
Reset:
00000000
SCI Control Register 2 (SCC2)
Read:
SCTIE
TCIE
SCRIE
ILIE
TE
RE
RWU
SBK
Write:
Reset:
00000000
SCI Control Register 3 (SCC3)
Read:
R8
T8
R
ORIE
NEIE
FEIE
PEIE
Write:
Reset:
U
000000
SCI Status Register 1 (SCS1)
Read:
SCTE
TC
SCRF
IDLE
OR
NF
FE
PE
Write:
Reset:
11000000
SCI Data Register (SCDR)
Read:
R7
R6
R5
R4
R3
R2
R1
R0
Write:
T7
T6
T5
T4
T3
T2
T1
T0
Reset:
Unaffected by Reset
SCI Baud Rate Register (SCBR)
Read:
0
SCP1
SCP0
R
SCR2
SCR1
SCR0
Write:
Reset:
00000000
= Unimplemented
U = Unaffected
R = Reserved
Figure 16-5. SCI Transmitter I/O Register Summary
Table 16-3. SCI Transmitter I/O Address Summary
Register
SCC1
SCC2
SCC3
SCS1
SCDR
SCBR
Address
$0013
$0014
$0015
$0016
$0018
$0019