PXR40RM Datasheet, PDF (933/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Enhanced Serial Communication Interface (eSCI)
26.1.6.4 Stop Mode
When the eSCI module is in Stop mode, it is inactive and indicates to the system, that all clocks to the eSCI
modules can be turned off.
The system requests the eSCI module to enter the Stop mode by asserting the system stop signal. When
this happens, the eSCI module performs a shut down of the ongoing transmission or reception as described
in Section 26.1.6.4.1, Entering Stop Mode from SCI Mode, and Section 26.1.6.4.3, If the eSCI module is
in Stop mode and the system stop signal is de-asserted and the LIN bit and the MDIS bit are 0, the eSCI
module will enter the SCI mode. The TRDE flag will bet set. No data will be transmitted as long as new
data provided by the application. If the receiver is still enabled, it starts the detection of the start
bit.Entering Stop Mode from LIN Mode.
The system requests the eSCI module to leave the Stop mode by de-asserting the system stop signal. When
this happens, the eSCI module then enters the operational mode configured by the LIN bit and the MDIS
bit. The related sequence is described in Section 26.1.6.4.2, Leaving Stop Mode into SCI Mode, and
Section 26.1.6.4.4, Leaving Stop Mode into LIN Mode.
26.1.6.4.1 Entering Stop Mode from SCI Mode
If the eSCI module is in SCI mode and the system stop signal is asserted while a SCI frame or character
transmission is running, the eSCI module performs a shut down of the transmit process. Therefore, it
continues the ongoing frame or character transmission until the last bit of the SCI frame or character has
been transmitted. After the end of the transmission, all pending transfer requests are cleared and no more
data will be transmitted. None of the transmitter related register flags will be set
If the eSCI module is in SCI mode and the system stop signal is asserted while a SCI frame or character
reception is running, the module stops the reception immediatley. None of the receiver related register
flags will be set.
If the eSCI module is in SCI mode and the system stop signal is asserted and no transmission or reception
is running, the eSCI module will enter the Stop mode.
26.1.6.4.2 Leaving Stop Mode into SCI Mode
26.1.6.4.3
If the eSCI module is in Stop mode and the system stop signal is de-asserted and the LIN
bit and the MDIS bit are 0, the eSCI module will enter the SCI mode. The TRDE flag will
bet set. No data will be transmitted as long as new data provided by the application. If the
receiver is still enabled, it starts the detection of the start bit.Entering Stop Mode from
LIN Mode
If the eSCI module is in LIN mode and the system stop signal is asserted while a LIN byte field or character
transmission is running, the eSCI module performs a shut down of the transmit process. Therefore, it
continues the ongoing LIN byte field or character transmission until the last bit of the LIN byte field or
character has been transmitted. After the end of the transmission, all pending transfer requests are cleared
and no more data will be transmitted. None of the transmitter related register flags will be set.
Freescale Semiconductor
PXR40 Microcontroller Reference Manual, Rev. 1
26-5