Enhanced Serial Communication Interface (eSCI)
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 31-27
The maximum percent difference between the receiver baud rate and the transmitter baud rate is:
Eqn. 31-10
The maximum percent differences for the supported frames is given in Table 31-21
31.4.5 SCI Mode
31.4.5.1 SCI Mode Configuration
The application must configure the following bits and fields in order to achieve correct SCI operation.
• enable SCI Mode
– eSCI LIN Control Register 1 (eSCI_LCR1)[LIN] = 0
•select baud rate
– eSCI Baud Rate Register (eSCI_BRR)[SBR]
•select receiver input mode
– eSCI Control Register 1 (eSCI_CR1)[LOOPS]
– eSCI Control Register 1 (eSCI_CR1)[RSRC]
•select frame format
– eSCI Control Register 1 (eSCI_CR1)[M]
– eSCI Control Register 1 (eSCI_CR1)[PE]
– eSCI Control Register 1 (eSCI_CR1)[WAKE]
– eSCI Control Register 3 (eSCI_CR3)[M2]
•select parity type
– eSCI Control Register 1 (eSCI_CR1)[PT]
31.4.5.2 Transmitter
The transmitter supports the transmission of all frame types defined in Table 31-15, of all break characters
defined in Table 31-17, and of all idle characters defined in Table 31-18.
31.4.5.2.1 Transmitter States and Transitions
The transmitter has four basic states that are shown and described in Table 31-22. The state transitions that
can triggered by the application commands are shown in Table 31-23. The state transitions that can
Table 31-21. Slower Receiver Maximum Tolerance
Payload Bits Stop Bits Max Baudrate Difference rx
STOP
tx
START
8 1 4.37% 153 160
9 1 3.97% 169 176
9 2 3.57% 185 196
13 2 2.73% 249 256
baudrate
tx
START
rx
STOP
–
tx
START
------------------------------------------
100
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