NXP Semiconductors MPC5644A, Reference Manual, Page: 1369 / 1735

Enhanced Serial Communication Interface (ESCI)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 1369
31.4.5.3.2 Receiver input mode selection
This section describes the three receiver input modes supported by the eSCI module. The modes are
selected by the LOOPS and RSRC control bits in the
Control register 1 (eSCI_CR1) .
31.4.5.3.3 Dual wire mode
In Dual Wire Mode, the eSCI uses the TXD pin for transmitting and the RXD pin for data receiving.
Figure 31-28. Dual Wire Mode
31.4.5.3.4 Single wire mode
In Single Wire Mode, the RXD pin is disconnected from the eSCI module and the TXD pin is used for
both receiving and transmitting.
Figure 31-29. Single Wire Mode
Table 31-31. Receiver Module Transition
Transition Condition Action Description
start (State=Ready,Run)
and
(start bit qualified)
RACT:=1 Start of reception of data frame or break character.
done (State=Run)
and
(start bit not verified or
idle character received)
RACT:=0 Start Bit not Verified or Idle Character received.
wake0 (State=Wake-up)
and
(idle character received)
RWU:=0 Wake-up Idle Character received.
wake1 (State=Wake-up)
and
(address frame received)
RWU:=0 Wake-up address frame received.
RXD
TRANSMITTER
RECEIVER
TXD
TRANSMITTER
RECEIVER RXD
TXD