MC68HC708MP16 Datasheet, PDF (307/398 Pages) Freescale Semiconductor, Inc – Microcontrollers

Serial Communications Interface Module (SCI)
14.8.3 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 SCI receiver full (SCRF)
• Enables SCI transmitter empty (SCTE)
• Enables the following interrupts:
– Receiver overrun interrupts
– Noise error interrupts
– Framing error interrupts
– Parity error interrupts
Address: $003A
Bit 7
6
5
Read: R8
0
T8
Write:
4
3
2
1
Bit 0
0
ORIE NEIE FEIE PEIE
Reset: U
U
0
0
0
0
0
0
= Unimplemented
U = Unaffected
Figure 14-9. 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.
MC68HC708MP16 — Rev. 3.1
Freescale Semiconductor
Serial Communications Interface Module (SCI)
Technical Data
307