NXP Semiconductors PXN2020, Reference Manual, Page: 1010 / 1376

Enhanced Serial Communication Interface (eSCI)
PXN20 Microcontroller Reference Manual, Rev. 1
31-20 Freescale Semiconductor
31.4 Functional Description
This section provides a complete functional description of the eSCI block, detailing the operation of the
design from the end user perspective in a number of subsections.
31.4.1 Module Control
The operational mode of the module is controlled by the MDIS bit in the eSCI Control Register 2
(eSCI_CR2). The module can transmit and receive data when it is enabled, i.e., MDIS = 1.
31.4.2 Frame Formats
The eSCI module uses the standard NRZ mark/space data format. The eSCI supports three basic frame
types, which are the data frames, break characters, and idle characters.
31.4.2.1 Data Frame Formats
Each data frame contains a character that is surrounded by a start bit, an optional parity or address bit, and
one or two stop bits. The supported data frame formats for transmission and reception are specified in
Table 31-15 . The supported data frame formats for reception only are specified in Table 31-16 .
Table 31-15. Supported Data Frame Formats for RX and TX
Control Frame Content
eSCI_CR3 eSCI_CR1
Start
Bits
Payload Bits
Stop
Bits
M2 M PE WAKE
Character
Bits
Address
Bits
1
1
The address bit identifies the frame as an address character. See Section 31.4.5.5, Multiprocessor
Communication.
Parity
Bits
LIN byte fields ( Figure 31-15 )
0 0 0 0 1 8 0 0 1
SCI frames (8 payload bits)( Figure 31-16 )
0 0 0 0 1 8 0 0 1
0 0 0 1 1 7 1 0 1
0 0 1 0 1 7 0 1 1
SCI frames (9 payload bits) ( Figure 31-17 )
0 1 0 0 1 9 0 0 1
0 1 0 1 1 8 1 0 1
0 1 1 0 1 8 0 1 1