MC68HC08AS32 Datasheet, PDF (170/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

12.8.1 SCI Control Register 1
SCI control register 1:
• 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: $0013
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
LOOPS
ENSCI
TXINV
M
WAKE
ILTY
PEN
PTY
Reset:
0
0
0
0
0
0
0
0
Figure 12-8. SCI Control Register 1 (SCC1)
NOTE:
LOOPS — Loop Mode Select Bit
This read/write bit enables loop mode operation. In loop mode the PTE1/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.
1 = Loop mode enabled
0 = Normal operation enabled
ENSCI — Enable SCI 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 = SCI enabled
0 = SCI disabled
TXINV — Transmit Inversion Bit
This read/write bit reverses the polarity of transmitted data. Reset clears the
TXINV bit.
1 = Transmitter output inverted
0 = Transmitter output not inverted
Setting the TXINV bit inverts all transmitted values, including idle, break, start, and
stop bits.
Data Sheet
170
MC68HC08AS32 — Rev. 4.1
Freescale Semiconductor