mc68hc908kx8 Freescale Semiconductor, Inc, mc68hc908kx8 Datasheet - Page 125
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mc68hc908kx8
Manufacturer Part Number
mc68hc908kx8
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908KX8.pdf
(210 pages)
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12.7 I/O Registers
These I/O registers control and monitor SCI operation:
12.7.1 SCI Control Register 1
SCI control register 1 (SCC1):
LOOPS — Loop Mode Select Bit
ENSCI — Enable SCI Bit
Freescale Semiconductor
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This read/write bit enables loop mode operation. In loop mode the RxD pin is disconnected from the
SCI, and the transmitter output goes into the receiver input. Both the transmitter and the receiver must
be enabled to use loop mode. Reset clears the LOOPS bit.
This read/write bit enables the SCI and the SCI baud rate generator. Clearing ENSCI sets the SCTE
and TC bits in SCI status register 1 and disables transmitter interrupts. Reset clears the ENSCI bit.
1 = Loop mode enabled
0 = Normal operation enabled
1 = SCI enabled
0 = SCI disabled
SCI control register 1 (SCC1)
SCI control register 2 (SCC2)
SCI control register 3 (SCC3)
SCI status register 1 (SCS1)
SCI status register 2 (SCS2)
SCI data register (SCDR)
SCI baud rate register (SCBR)
Enables loop mode operation
Enables the SCI
Controls output polarity
Controls character length
Controls SCI wakeup method
Controls idle character detection
Enables parity function
Controls parity type
Address:
Reset:
Read:
Write:
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
LOOPS
$0013
Bit 7
0
Figure 12-10. SCI Control Register 1 (SCC1)
ENSCI
6
0
TXINV
5
0
M
4
0
WAKE
3
0
ILTY
2
0
PEN
1
0
Bit 0
PTY
0
I/O Registers
125
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