NXP Semiconductors MPC5644A, Reference Manual, Page: 1375 / 1735

Enhanced Serial Communication Interface (ESCI)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 1375
31.4.5.3.17 Stop bit verification
The reception of a valid stop bit is verified if at least two out of the sample RSC8, RSC9, and RSC10 are
sampled high. If this is not that case, a framing error is detected. Noise is detected if not all of the samples
are of the same value. In this case, the noise flag eSCI_IFSR1[NF] is set. The result of the stop bit
verification is summarized in
Table 31-35 .
31.4.5.3.18 Parity checking
The eSCI module calculates the parity of a received character and checks is versus the received parity bit
in the received data frame when the parity enable bit PE in the
Control register 1 (eSCI_CR1) is set. The
parity type bit PT in the Control register 1 (eSCI_CR1) defines whether to check for odd or even parity is
generated. If an parity error is detected, this is reported as described in Section 31.4.5.4, Reception error
reporting ”.
31.4.5.4 Reception error reporting
The receiver can detect four error types: parity errors, framing errors, noise errors, and the overrun error.
The receiver reports the errors detected during frame reception at the end of the reception of the last stop
bit of a frame. For error reporting the receiver utilizes the OR, NF, FE, and PF flags in the
Interrupt Flag
and Status Register 1 (eSCI_IFSR1) .
If the receiver has detected an overrun as described in Section 31.4.5.3.11, Receiver overrun ”, only the OR
flag is set. All other error flags are not updated.
If the receiver has detected noise as described in Section 31.4.5.3.13, Bit sampling ” the NF flag is set.
110 1 Yes
111 1 No
Table 31-35. Stop Bit Verification
[RSC8, RSC9, RSC10] Stop Bit Verified Framing Error Detected Noise Detected
000 No Yes No
001 No Yes Yes
010 No Yes Yes
100 No Yes Yes
011 Yes No Yes
101 Yes No Yes
110 Yes No Yes
111 Yes No No
Table 31-34. Data Bit Sampling (continued)
[RSC8, RSC9, RSC10] Data Bit Value Noise Detected