Enhanced Serial Communication Interface (eSCI)
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 31-33
The module transition shown in Table 31-28 are triggered when the described event occurs.
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 eSCI 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.
Table 31-27. Receiver Application Transition
Transition Command Condition Action Description
EN RE = 1 RE = 0 Receiver is enabled by application command.
DIS RE=0 RE=1 Receiver is disabled by application command
SLP RWU = 1 RE = 1 Receiver is set into wakeup mode
Table 31-28. Receiver Module Transition
Transition Condition Action Description
start (State = Ready, Run)
and
(start bit received)
RACT:= 1 Start of reception of data frame or break character.
done (State = Run)
and
(idle character received)
RACT:= 0 Idle Character received.
wake0 (State = Wakeup)
and
(idle character received)
RWU:= 0 Wakeup Idle Character received.
wake1 (State = Wakeup)
and
(address frame received)
RWU:= 0 Wakeup address frame received.
RXD
TRANSMITTER
RECEIVER
TXD
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