MC68HC08AS32A Datasheet, PDF (175/296 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
Functional Description
Addr.
$0013
$0014
$0015
$0016
$0017
$0018
$0019
Register Name
SCI Control Register 1 ^Read:
(SCC1) Write:
See page 187. _Reset:
SCI Control Register 2 ^Read:
(SCC2) Write:
See page 189. _Reset:
SCI Control Register 3 ^Read:
(SCC3) Write:
See page 191. _Reset:
SCI Status Register 1 ^Read:
(SCS1) Write:
See page 192. _Reset:
SCI Status Register 2 ^Read:
(SCS2) Write:
See page 195. _Reset:
SCI Data Register ^Read:
(SCDR) Write:
See page 196. _Reset:
SCI Baud Rate Register ^Read:
(SCBR) Write:
See page 196. _Reset:
Bit 7
LOOPS
0
SCTIE
0
R8
U
SCTE
1
0
R7
T7
0
6
ENSCI
0
TCIE
0
T8
U
TC
5
TXINV
0
SCRIE
0
R
0
SCRF
1
0
0
0
R6
R5
T6
T5
SCP1
0
0
= Unimplemented
4
3
2
1
Bit 0
M
WAKE ILTY
PEN
PTY
0
0
0
0
0
ILIE
TE
RE
RWU
SBK
0
0
0
0
0
R
ORIE
NEIE
FEIE
PEIE
0
0
0
0
0
IDLE
OR
NF
FE
PE
0
0
0
0
0
BKF
RPF
0
0
0
0
0
R4
R3
R2
R1
R0
T4
T3
T2
T1
T0
Unaffected by reset
SCP0
R
SCR2 SCR1 SCR0
0
0
0
0
0
R = Reserved
U = Unaffected
Figure 13-4. SCI I/O Register Summary
13.4.2 Transmitter
Figure 13-5 shows the structure of the SCI transmitter.
The baud rate clock source for the SCI can be selected via the configuration bit,
SCIBDSRC. Source selection values are shown in Figure 13-5.
13.4.2.1 Character Length
The transmitter can accommodate either 8-bit or 9-bit data. The state of the M bit
in SCI control register 1 (SCC1) determines character length. When transmitting
9-bit data, bit T8 in SCI control register 3 (SCC3) is the ninth bit (bit 8).
MC68HC08AS32A — Rev. 1
MOTOROLA
Serial Communications Interface (SCI)
For More Information On This Product,
Go to: www.freescale.com
Data Sheet
175