MC908QY8CDWE Datasheet, PDF (130/232 Pages) Freescale Semiconductor, Inc – Addendum to MC68HC908QB8, rev. 3

Enhanced Serial Communications Interface (ESCI) Module
NORMAL FLAG CLEARING SEQUENCE
BYTE 1
BYTE 2
BYTE 3
BYTE 4
READ SCS1
SCRF = 1
OR = 0
READ SCDR
BYTE 1
READ SCS1
SCRF = 1
OR = 0
READ SCDR
BYTE 2
READ SCS1
SCRF = 1
OR = 0
READ SCDR
BYTE 3
DELAYED FLAG CLEARING SEQUENCE
BYTE 1
BYTE 2
BYTE 3
BYTE 4
READ SCS1
SCRF = 1
OR = 0
READ SCS1
SCRF = 1
OR = 1
READ SCDR
BYTE 1
READ SCDR
BYTE 3
Figure 13-13. Flag Clearing Sequence
FE — Receiver Framing Error Bit
This clearable, read-only bit is set when a 0 is accepted as the stop bit. FE generates an ESCI error
interrupt request if the FEIE bit in SCC3 also is set. Clear the FE bit by reading SCS1 with FE set and
then reading the SCDR.
1 = Framing error detected
0 = No framing error detected
PE — Receiver Parity Error Bit
This clearable, read-only bit is set when the ESCI detects a parity error in incoming data. PE generates
a PE interrupt request if the PEIE bit in SCC3 is also set. Clear the PE bit by reading SCS1 with PE
set and then reading the SCDR.
1 = Parity error detected
0 = No parity error detected
MC68HC908QB8 Data Sheet, Rev. 3
128
Freescale Semiconductor