Motorola MC68VZ328 用户手册
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Programming Model
Universal Asynchronous Receiver/Transmitter 1 and 2
14-27
RTS2
CONT
Bit 7
CONT
Bit 7
RTS2 Control—This bit selects the function of the RTS2 pin.
0 = RTS2 pin is controlled by the
RTS2 bit.
1 = RTS2 pin is controlled by the
receiver FIFO. When no more
than four slots are available,
RTS2 is negated.
than four slots are available,
RTS2 is negated.
RTS2
Bit 6
Bit 6
Request to Send Pin—This bit controls the RTS2 pin when
the RTS2 CONT bit is 0.
the RTS2 CONT bit is 0.
0 = RTS2 pin is 1.
1 = RTS2 pin is 0.
1 = RTS2 pin is 0.
IRDAEN
Bit 5
Bit 5
Infrared Enable—This bit enables the IrDA interface.
0 = Normal NRZ operation.
1 = IrDA operation.
IRDA
LOOP
Bit 4
LOOP
Bit 4
Loop Infrared—This bit controls the loopback from the trans-
mitter to the receiver in the IrDA interface. This bit is used for
system testing purposes.
mitter to the receiver in the IrDA interface. This bit is used for
system testing purposes.
0 = No infrared loop.
1 = Connect the infrared transmitter
1 = Connect the infrared transmitter
to an infrared receiver.
RXPOL
Bit 3
Bit 3
Receive Polarity—This bit controls the polarity of the received
data.
data.
0 = Normal polarity (1 = idle).
1 = Inverted polarity (0 = idle).
1 = Inverted polarity (0 = idle).
TXPOL
Bit 2
Bit 2
Transmit Polarity—This bit controls the polarity of the trans-
mitted data.
mitted data.
0 = Normal polarity (1 = idle).
1 = Inverted polarity (0 = idle).
1 = Inverted polarity (0 = idle).
Reserved
Bits 1–0
Bits 1–0
Reserved
These bits are reserved and should
be set to 0.
be set to 0.
Table 14-14. UART 2 Miscellaneous Register Description (Continued)
Name
Description
Setting