Freescale Semiconductor PXR4030, Reference Manual

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Enhanced Serial Communication Interface (eSCI)
Freescale Semiconductor 26-33
PXR40 Microcontroller Reference Manual, Rev. 1
Figure 26-27. Receiver State Diagram
The current state of the receiver can be determined by the RE and RWU bit in the Control
Register 1 (eSCI_CR1) and the RACT status bit in Interrupt Flag and Status Register 1 (eSCI_IFSR1) .
The application triggers a transition described in Table 26-30 when it issues a command by writing to the
RE bit in the Control Register 1 (eSCI_CR1) . The transition is triggered only if the conditions are fulfilled.
As a result of the transition the state of the receiver is changed as shown in Figure 26-27 and the action
given in Table 26-30 is executed.
The module transition shown in Table 26-31 are triggered when the described event occurs.
Table 26-29. Receiver States
State
Indication
Description
RE RACT RWU
Idle 0 0 0 Receiver is disabled and no reception is running
Ready 1 0 0 Receiver is enabled and no reception is running
Run 1 1 0 Receiver is enabled and reception is running
Wakeup 1 - 1 Receiver is in wakeup mode
Table 26-30. 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
Ready
EN
start
Idle
RESET_STATE
DIS DIS
done
Run
Wakeup
SLP SLP
wake0 wake1