MC68HC08AS32A Datasheet, PDF (191/296 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
I/O Registers
NOTE:
Do not toggle the SBK bit immediately after setting the SCTE bit. Toggling SBK
before the preamble begins causes the SCI to send a break character instead of a
preamble.
13.8.3 SCI Control Register 3
SCI control register 3:
• Stores the ninth SCI data bit received and the ninth SCI data bit to be
transmitted
• Enables these interrupts:
– Receiver overrun interrupts
– Noise error interrupts
– Framing error interrupts
• Parity error interrupts
Address:
Read:
Write:
Reset:
$0015
Bit 7
6
5
R8
T8
R
4
3
2
1
Bit 0
R
ORIE
NEIE
FEIE
PEIE
U
U
0
= Unimplemented
0
0
0
0
0
R = Reserved
U = Unaffected
Figure 13-12. SCI Control Register 3 (SCC3)
R8 — Received Bit 8
When the SCI is receiving 9-bit characters, R8 is the read-only ninth bit (bit 8)
of the received character. R8 is received at the same time that the SCDR
receives the other 8 bits.
When the SCI is receiving 8-bit characters, R8 is a copy of the eighth bit (bit 7).
Reset has no effect on the R8 bit.
T8 — Transmitted Bit 8
When the SCI is transmitting 9-bit characters, T8 is the read/write ninth bit (bit 8)
of the transmitted character. T8 is loaded into the transmit shift register at the
same time that the SCDR is loaded into the transmit shift register. Reset has no
effect on the T8 bit.
ORIE — Receiver Overrun Interrupt Enable Bit
This read/write bit enables SCI error CPU interrupt requests generated by the
receiver overrun bit, OR.
1 = SCI error CPU interrupt requests from OR bit enabled
0 = SCI error CPU interrupt requests from OR bit disabled
NEIE — Receiver Noise Error Interrupt Enable Bit
This read/write bit enables SCI error CPU interrupt requests generated by the
noise error bit, NE. Reset clears NEIE.
1 = SCI error CPU interrupt requests from NE bit enabled
0 = SCI error CPU interrupt requests from NE bit disabled
MC68HC08AS32A — Rev. 1
MOTOROLA
Serial Communications Interface (SCI)
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Data Sheet
191