
Infrared Serial Communications Interface (IrSCI)
MC68HC08LK60 MC68HC908LK60 Advance Information Data Sheet, Rev. 1.1
136
Freescale Semiconductor
LOOPS — Loop mode select bit
This bit enables loop mode operation for the SCI only. 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. This bit does not affect the infrared encoder/decoder.
1 = Loop mode enabled
0 = Normal operation enabled
ENSCI — Enable SCI bit
This 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.
1 = SCI enabled
0 = SCI disabled
M — Mode (character length) bit
This bit determines whether SCI characters are eight or nine bits long.
(See Table 12-5.) The ninth bit
can serve as an extra stop bit, as a receiver wakeup signal, or as a parity bit.
1 = 9-bit SCI characters
0 = 8-bit SCI characters
WAKE — Wakeup condition bit
This bit determines which condition wakes up the SCI: a logic 1 (address mark) in the most significant
bit position of a received character or an idle condition on the RxD pin.
1 = Address mark wakeup
0 = Idle line wakeup
ILTY — Idle line type bit
This bit determines when the SCI starts counting logic 1s as idle character bits. The counting begins
either after the start bit or after the stop bit. If the count begins after the start bit, then a string of logic
1s preceding the stop bit may cause false recognition of an idle character. Beginning the count after
the stop bit avoids false idle character recognition, but requires properly synchronized transmissions.
1 = Idle character bit count begins after stop bit
0 = Idle character bit count begins after start bit
PEN — Parity enable bit
This bit enables the SCI parity function.
(See Table 12-5.) When enabled, the parity function inserts a
parity bit in the most significant bit position. (See
Figure 12-5.)
1 = Parity function enabled
0 = Parity function disabled
Address:
$0013
Bit 7
654321
Bit 0
Read:
LOOPS
ENSCI
0
M
WAKE
ILTY
PEN
PTY
Write:
Reset:
00000000
Figure 12-11. SCI Control Register 1 (SCC1)