mc68hc908gr8b Freescale Semiconductor, Inc, mc68hc908gr8b Datasheet - Page 133

• Manufacturer Part Number: mc68hc908gr8b
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

13.4.2 Transmitter
Figure 13-5
The baud rate clock source for the SCI can be selected via the configuration bit, SCIBDSRC. Source
selection values are shown in
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).
Freescale Semiconductor
$0013
$0014
$0015
$0016
$0017
$0018
$0019
Addr.
SCI Baud Rate Register
Register Name
SCI Control Register 1
SCI Control Register 2
SCI Control Register 3
SCI Status Register 1
SCI Status Register 2
shows the structure of the SCI transmitter.
SCI Data Register
See page 144.
See page 146.
See page 147.
See page 149.
See page 151.
See page 152.
See page 152.
(SCDR)
(SCBR)
(SCC1)
(SCC2)
(SCC3)
(SCS1)
(SCS2)
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Write:
Write:
Write:
Figure
Figure 13-4. SCI I/O Register Summary
LOOPS
SCTIE
SCTE
MC68HC908GR8B Data Sheet, Rev. 3.0
Bit 7
R8
R7
T7
U
0
0
1
0
0
13-5.
= Unimplemented
ENSCI
TCIE
TC
R6
T8
T6
U
6
0
0
1
0
0
SCRIE
TXINV
SCRF
SCP1
R5
T5
R
5
0
0
0
0
0
0
Unaffected by reset
SCP0
IDLE
ILIE
R4
T4
M
R
R
4
0
0
0
0
0
0
= Reserved
WAKE
ORIE
OR
TE
R3
T3
R
3
0
0
0
0
0
0
SCR2
NEIE
ILTY
RE
NF
R2
T2
2
0
0
0
0
0
0
Functional Description
U = Unaffected
SCR1
RWU
FEIE
PEN
BKF
FE
R1
T1
1
0
0
0
0
0
0
SCR0
PEIE
Bit 0
PTY
SBK
RPF
PE
R0
T0
0
0
0
0
0
0
133