MC908AS60ACFU Datasheet, PDF (200/414 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Serial Communications Interface (SCI)
FE — Receiver Framing Error Bit
This clearable, read-only bit is set when a logic 0 is accepted as the stop bit. FE generates an SCI error
CPU 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. Reset clears the FE bit.
1 = Framing error detected
0 = No framing error detected
PE — Receiver Parity Error Bit
This clearable, read-only bit is set when the SCI detects a parity error in incoming data. PE generates
a SCI receiver CPU 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. Reset clears the PE bit.
1 = Parity error detected
0 = No parity error detected
18.8.5 SCI Status Register 2
SCI status register 2 contains flags to signal the following conditions:
• Break character detected
• Incoming data
Address: $0017
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
0
0
0
BKF
RPF
Write:
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 18-16. SCI Status Register 2 (SCS2)
BKF — Break Flag Bit
This clearable, read-only bit is set when the SCI detects a break character on the RxD pin. In SCS1,
the FE and SCRF bits are also set. In 9-bit character transmissions, the R8 bit in SCC3 is cleared. BKF
does not generate a CPU interrupt request. Clear BKF by reading SCS2 with BKF set and then reading
the SCDR. Once cleared, BKF can become set again only after 1s appear on the RxD pin followed by
another break character. Reset clears the BKF bit.
1 = Break character detected
0 = No break character detected
RPF — Reception in Progress Flag Bit
This read-only bit is set when the receiver detects a logic 0 during the RT1 time period of the start bit
search. RPF does not generate an interrupt request. RPF is reset after the receiver detects false start
bits (usually from noise or a baud rate mismatch), or when the receiver detects an idle character.
Polling RPF before disabling the SCI module or entering stop mode can show whether a reception is
in progress.
1 = Reception in progress
0 = No reception in progress
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
200
Freescale Semiconductor