MC68HC705C4ACB MOTOROLA [Motorola, Inc], MC68HC705C4ACB Datasheet - Page 119

• Manufacturer Part Number: MC68HC705C4ACB
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC705C4A • MC68HSC705C4A — Rev. 3.0
MOTOROLA
$000D
$000E
$000F
$0010
$0011
Addr.
SCI Control Register 1
SCI Control Register 2
SCI Status Register
Baud Rate Register
SCI Data Register
Register Name
See page 130.
See page 124.
See page 125.
See page 128.
See page 123.
(SCCR1)
(SCCR2)
Figure 10-3. SCI Transmitter I/O Register Summary
(SCSR)
(SCDR)
(Baud)
•
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read: TDRE
Read:
Write:
Write:
Write:
Write:
Write:
Break Characters — Writing a logic 1 to the SBK bit in SCCR2
loads the shift register with a break character. A break character
contains all logic 0s and has no start and stop bits. Break
character length depends on the M bit in SCCR1. As long as SBK
is at logic 1, transmitter logic continuously loads break characters
into the shift register. After software clears the SBK bit, the shift
register finishes transmitting the last break character and then
transmits at least one logic 1. The automatic logic 1 at the end of
a break character is to guarantee the recognition of the start bit of
the next character.
Serial Communications Interface (SCI)
Bit 7
Bit 7
TIE
R8
U
U
0
1
= Unimplemented
TCIE
Bit 6
TC
T8
U
U
6
0
1
RDRF
SCP1
Bit 5
RIE
5
0
0
0
U = Unaffected
SCP0
Unaffected by reset
IDLE
Bit 4
ILIE
M
U
4
0
0
0
Serial Communications Interface (SCI)
WAKE
Bit 3
OR
TE
U
U
3
0
0
SCR2
Bit 2
RE
NF
U
2
0
0
SCR1
RWU
Bit 1
Technical Data
FE
SCI Operation
U
1
0
0
SCR0
Bit 0
SBK
Bit 0
U
U
0
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