MC68HC08AS32A Datasheet, PDF (192/296 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
FEIE — Receiver Framing Error Interrupt Enable Bit
This read/write bit enables SCI error CPU interrupt requests generated by the
framing error bit, FE. Reset clears FEIE.
1 = SCI error CPU interrupt requests from FE bit enabled
0 = SCI error CPU interrupt requests from FE bit disabled
PEIE — Receiver Parity Error Interrupt Enable Bit
This read/write bit enables SCI error CPU interrupt requests generated by the
parity error bit, PE. See 13.8.4 SCI Status Register 1. Reset clears PEIE.
1 = SCI error CPU interrupt requests from PE bit enabled
0 = SCI error CPU interrupt requests from PE bit disabled
13.8.4 SCI Status Register 1
SCI status register 1 (SCS1) contains flags to signal these conditions:
• Transfer of SCDR data to transmit shift register complete
• Transmission complete
• Transfer of receive shift register data to SCDR complete
• Receiver input idle
• Receiver overrun
• Noisy data
• Framing error
• Parity error
Address: $0016
Bit 7
6
5
4
3
2
1
Bit 0
Read: SCTE
TC
SCRF
IDLE
OR
NF
FE
PE
Write:
Reset: 1
1
0
0
0
0
0
0
= Unimplemented
Figure 13-13. SCI Status Register 1 (SCS1)
SCTE — SCI Transmitter Empty Bit
This clearable, read-only bit is set when the SCDR transfers a character to the
transmit shift register. SCTE can generate an SCI transmitter CPU interrupt
request. When the SCTIE bit in SCC2 is set, SCTE generates an SCI transmitter
CPU interrupt request. In normal operation, clear the SCTE bit by reading SCS1
with SCTE set and then writing to SCDR. Reset sets the SCTE bit.
1 = SCDR data transferred to transmit shift register
0 = SCDR data not transferred to transmit shift register
TC — Transmission Complete Bit
This read-only bit is set when the SCTE bit is set, and no data, preamble, or
break character is being transmitted. TC generates an SCI transmitter CPU
interrupt request if the TCIE bit in SCC2 is also set. TC is automatically cleared
Data Sheet
192
Serial Communications Interface (SCI)
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MC68HC08AS32A — Rev. 1
MOTOROLA