PXN20RM Datasheet, PDF (1023/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

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