MC68HC908GR8A_07 Datasheet, PDF (135/260 Pages) Freescale Semiconductor, Inc – Microcontrollers

Functional Description
Addr.
$0013
$0014
$0015
$0016
$0017
$0018
$0019
Register Name
SCI Control Register 1 ^Read:
(SCC1) Write:
See page 146. _Reset:
SCI Control Register 2 ^Read:
(SCC2) Write:
See page 148. _Reset:
SCI Control Register 3 ^Read:
(SCC3) Write:
See page 149. _Reset:
SCI Status Register 1 ^Read:
(SCS1) Write:
See page 151. _Reset:
SCI Status Register 2 ^Read:
(SCS2) Write:
See page 153. _Reset:
SCI Data Register ^Read:
(SCDR) Write:
See page 154. _Reset:
SCI Baud Rate Register ^Read:
(SCBR) Write:
See page 154. _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).
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
Freescale Semiconductor
135