SCIx_S1 field descriptions (continued)
Field
Description
within any bit time in the frame, the flag NF is set at the same time as RDRF is set for the character. To
clear NF, read SCI_S1 and then read the SCI data register (SCI_D).
0
No noise detected.
1
Noise detected in the received character in SCI_D.
1
FE
Framing Error Flag
FE is set at the same time as RDRF when the receiver detects a logic 0 where the stop bits was expected.
This suggests the receiver was not properly aligned to a character frame. To clear FE, read SCI_S1 with
FE set and then read the SCI data register (SCI_D).
0
No framing error detected. This does not guarantee the framing is correct.
1
Framing error.
0
PF
Parity Error Flag
PF is set at the same time as RDRF when parity is enabled (PE = 1) and the parity bit in the received
character does not agree with the expected parity value. To clear PF, read SCI_S1 and then read the SCI
data register (SCI_D).
0
No parity error.
1
Parity error.
15.3.6 SCI Status Register 2 (SCIx_S2)
This register contains one read-only status flag.
When using an internal oscillator in a LIN system, it is necessary to raise the break
detection threshold one bit time. Under the worst case timing conditions allowed in LIN,
it is possible that a 0x00 data character can appear to be 10.26 bit times long at a slave
running 14% faster than the master. This would trigger normal break detection circuitry
designed to detect a 10-bit break symbol. When the LBKDE bit is set, framing errors are
inhibited and the break detection threshold changes from 10 bits to 11 bits, preventing
false detection of a 0x00 data character as a LIN break symbol.
Address: Base a 5h offset
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
0
0
0
0
0
0
0
0
SCIx_S2 field descriptions
Field
Description
7
LBKDIF
LIN Break Detect Interrupt Flag
LBKDIF is set when the LIN break detect circuitry is enabled and a LIN break character is detected.
LBKDIF is cleared by writing a 1 to it.
Table continues on the next page...
Chapter 15 Serial communications interface (SCI)
MC9S08PT60 Reference Manual, Rev. 4, 08/2014
Freescale Semiconductor, Inc.
425
Содержание MC9S08PT60
Страница 2: ...MC9S08PT60 Reference Manual Rev 4 08 2014 2 Freescale Semiconductor Inc...
Страница 34: ...MC9S08PT60 Reference Manual Rev 4 08 2014 34 Freescale Semiconductor Inc...
Страница 40: ...System clock distribution MC9S08PT60 Reference Manual Rev 4 08 2014 40 Freescale Semiconductor Inc...
Страница 120: ...Flash and EEPROM registers descriptions MC9S08PT60 Reference Manual Rev 4 08 2014 120 Freescale Semiconductor Inc...
Страница 200: ...Port data registers MC9S08PT60 Reference Manual Rev 4 08 2014 200 Freescale Semiconductor Inc...
Страница 228: ...System clock gating control registers MC9S08PT60 Reference Manual Rev 4 08 2014 228 Freescale Semiconductor Inc...
Страница 262: ...Human machine interfaces HMI MC9S08PT60 Reference Manual Rev 4 08 2014 262 Freescale Semiconductor Inc...
Страница 298: ...Functional Description MC9S08PT60 Reference Manual Rev 4 08 2014 298 Freescale Semiconductor Inc...
Страница 396: ...FTM Interrupts MC9S08PT60 Reference Manual Rev 4 08 2014 396 Freescale Semiconductor Inc...
Страница 440: ...Functional description MC9S08PT60 Reference Manual Rev 4 08 2014 440 Freescale Semiconductor Inc...
Страница 468: ...Initialization Application Information MC9S08PT60 Reference Manual Rev 4 08 2014 468 Freescale Semiconductor Inc...
Страница 570: ...Application information MC9S08PT60 Reference Manual Rev 4 08 2014 570 Freescale Semiconductor Inc...
Страница 648: ...Memory map and register description MC9S08PT60 Reference Manual Rev 4 08 2014 648 Freescale Semiconductor Inc...
Страница 676: ...Resets MC9S08PT60 Reference Manual Rev 4 08 2014 676 Freescale Semiconductor Inc...