MC68HC708AS48

Manufacturer Part NumberMC68HC708AS48
DescriptionAdvance Information
ManufacturerFREESCALE [Freescale Semiconductor, Inc]
MC68HC708AS48 datasheet
 
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Page 271/396

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RWU — Receiver Wakeup Bit
This read/write bit puts the receiver in a standby state during which
receiver interrupts are disabled. The WAKE bit in SCC1 determines
whether an idle input or an address mark brings the receiver out of the
standby state and clears the RWU bit. Reset clears the RWU bit.
SBK — Send Break Bit
Setting and then clearing this read/write bit transmits a break
character followed by a logic 1. The logic 1 after the break character
guarantees recognition of a valid start bit. If SBK remains set, the
transmitter continuously transmits break characters with no logic 1s
between them. Reset clears the SBK bit.
NOTE:
Do not toggle the SBK bit immediately after setting the SCTE bit
because toggling SBK too early causes the SCI to send a break
character instead of a preamble.
17.9.3 SCI Control Register 3
SCI control register 3:
MC68HC708AS48
Rev. 4.0
MOTOROLA
1 = Standby state
0 = Normal operation
1 = Transmit break characters
0 = No break characters transmitted
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
Serial Communications Interface (SCI)
Serial Communications Interface (SCI)
I/O Registers
Advance Information
271