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Enhanced Serial Communication Interface (eSCI)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
21-19
21.4.2
Data Format
The eSCI uses the standard NRZ mark/space data format. Each data character is contained in a frame that
includes a start bit, eight or nine data bits, and a stop bit. Clearing the M bit in eSCI control register 1
configures the eSCI for 8-bit data characters. A frame with eight data bits has a total of 10 bits. Setting the
M bit configures the eSCI for 9-bit data characters. A frame with nine data bits has a total of 11 bits.
When the eSCI is configured for 9-bit data characters, the ninth data bit is the T8 bit in the eSCI data
register (ESCI
x
_DR). It remains unchanged after transmission and can be used repeatedly without
rewriting it. A frame with nine data bits has a total of 11 bits.
The two different data formats are illustrated in
show the
number of each type of bit in 8-bit data format and 9-bit data format, respectively.
Figure 21-12. eSCI Data Formats
Table 21-15. Example of 8-bit Data Formats
Start
Bit
Data
Bits
Address
Bits
Parity
Bits
Stop
Bit
1
8
0
0
1
1
7
0
1
1
1
7
1
1
1
The address bit identifies the frame as an address
character. Refer to
Section 21.4.5.6, “Receiver Wake-up
.”
0
1
Table 21-16. Example of 9-Bit Data Formats
Start
Bit
Data
Bits
Address
Bits
Parity
Bits
Stop
Bit
1
9
0
0
1
1
8
0
1
1
1
8
1
1
1
The address bit identifies the frame as an address
character. Refer to
Section 21.4.5.6, “Receiver Wake-up
.”
0
1
Parity or
STOP
Bit
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Next
START
Bit
START
Bit
Data Bit
8-bit Data Format
Bit M in ESCI
x
_CR1 Clear
STOP
Bit
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Next
START
Bit
START
Bit
9-bit Data Format
Bit M in ESCI
x
_CR1 Set
Parity or
Bit 8
Data Bit
Summary of Contents for MPC5566
Page 81: ...Introduction MPC5566 Microcontroller Reference Manual Rev 2 1 24 Freescale Semiconductor...
Page 135: ...Signal Description MPC5566 Microcontroller Reference Manual Rev 2 2 54 Freescale Semiconductor...
Page 189: ...Reset MPC5566 Microcontroller Reference Manual Rev 2 4 20 Freescale Semiconductor...
Page 603: ...Flash Memory MPC5566 Microcontroller Reference Manual Rev 2 13 38 Freescale Semiconductor...
Page 609: ...SRAM MPC5566 Microcontroller Reference Manual Rev 2 14 6 Freescale Semiconductor...
Page 1073: ...MPC5566 Microcontroller Reference Manual Rev 2 22 36 Freescale Semiconductor...
Page 1185: ...Nexus MPC5566 Microcontroller Reference Manual Rev 2 25 92 Freescale Semiconductor...