MMCCMB2107 Freescale, MMCCMB2107 Datasheet - Page 366

• Manufacturer Part Number: MMCCMB2107
• Manufacturer: Freescale

Specifications of MMCCMB2107

• Lead Free Status / RoHS Status: Not Compliant

Serial Communications Interface Modules (SCI1 and SCI2)
16.13 Single-Wire Operation
Technical Data
366
NOTE:
Serial Communications Interface Modules (SCI1 and SCI2)
addresses match, the receiver processes the frames that follow. If the
addresses do not match, user code must put the receiver back to sleep
by setting the RWU bit. The RWU bit remains set and the receiver
remains on standby until another address frame appears on the RXD
pin.
The address mark clears the RWU bit before the stop bit is received and
sets the RDRF flag.
Address mark wakeup allows messages to contain idle frames but
requires that the most significant byte (MSB) be reserved for address
data.
With the WAKE bit clear, setting the RWU bit after the RXD pin has been
idle can cause the receiver to wake up immediately.
Normally, the SCI uses the TXD pin for transmitting and the RXD pin for
receiving (LOOPS = 0, RSRC = X). In single-wire mode, the RXD pin is
disconnected from the SCI and is available as a general-purpose I/O pin.
The SCI uses the TXD pin for both receiving and transmitting.
In single-wire mode (LOOPS = 1, RXRC = 1), setting the data direction
bit for the TXD pin configures TXD as the output for transmitted data.
Clearing the data direction bit configures TXD as the input for received
data.
Freescale Semiconductor, Inc.
Figure 16-25. Single-Wire Operation (LOOPS = 1, RSRC = 1)
TXD SCIDDR
TXD SCIDDR
For More Information On This Product,
BIT = 1
BIT = 0
Go to: www.freescale.com
TRANSMITTER
TRANSMITTER
RECEIVER
RECEIVER
NC
WOMS
RXD
RXD
TXD
TXD
GENERAL-PURPOSE I/O
GENERAL-PURPOSE I/O
MMC2107 – Rev. 2.0
MOTOROLA