mc68hc912bd32 Freescale Semiconductor, Inc, mc68hc912bd32 Datasheet - Page 152

• Manufacturer Part Number: mc68hc912bd32
• Description: 16-bit Device Composed Of Standard On-chip Peripherals
• Manufacturer: Freescale Semiconductor, Inc

SC0CR1 — SCI Control Register 1
Serial Interface
MC68HC912BD32 Rev 1.0
RESET:
LOOPS
Bit 7
0
WOMS
6
0
LOOPS — SCI LOOP Mode/Single Wire Mode Enable
WOMS — Wired-Or Mode for Serial Pins
RSRC — Receiver Source
Read or write anytime.
If the DDRS bit associated with the TXD pin is set during the LOOPS
= 1, the TXD pin outputs the SCI waveform. If the DDRS bit
associated with the TXD pin is clear during the LOOPS = 1, the TXD
pin becomes high (IDLE line state) for RSRC = 0 and high impedance
for RSRC = 1. Refer to
This bit controls the two pins (TXD and RXD) associated with the SCI
section.
When LOOPS = 1, the RSRC bit determines the internal feedback
path for the receiver.
Freescale Semiconductor, Inc.
For More Information On This Product,
0 = SCI transmit and receive sections operate normally.
1 = SCI receive section is disconnected from the RXD pin and the
0 = Pins operate in a normal mode with both high and low drive
1 = Each pin operates in an open drain fashion if that pin is
0 = Receiver input is connected to the transmitter internally (not
1 = Receiver input is connected to the TXD pin
RSRC
5
0
RXD pin is available as general purpose I/O. The receiver input
is determined by the RSRC bit. The transmitter output is
controlled by the associated DDRS bit. Both the transmitter
and the receiver must be enabled to use the LOOP or the
single wire mode.
capability. To affect the RXD bit, that bit would have to be
configured as an output (via DDRS) which is the single wire case
when using the SCI. WOMS bit still affects general purpose
output on TXD and RXD pins when SCI is not using these pins.
declared as an output.
TXD pin)
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Serial Interface
M
4
0
WAKE
Table
3
0
30.
ILT
2
0
PE
1
0
Bit 0
PT
0
$00C2
6-sint