MCCIRM Freescale Semiconductor / Motorola, MCCIRM Datasheet - Page 22

• Manufacturer Part Number: MCCIRM
• Description: MCCIRM Multi-Channel Communications Interface Reference Manual
• Manufacturer: Freescale Semiconductor / Motorola

Signal Descriptions
2.4.1 Receive Data Pins (RXDA and RXDB)
2.4.2 Transmit Data Pins (TXDA and TXDB)
Reference Manual
22
The MDDR and WOMC assignments are valid regardless of whether the
pins are configured for SPI use or general-purpose I/O.
The SCI pins and their functions are listed in
RXDA and RXDB are the serial data inputs to the SCIA and SCIB
interfaces, respectively.
Each pin is also available as a general-purpose I/O pin when the
receiver enable (RE) bit in control register 1 (SCCR1) of the associated
SCI submodule is cleared. When used for general-purpose I/O, RXDA
and RXDB may be configured either as input or output as determined by
the RXDA and RXDB bits in the MDDR.
When used for general-purpose I/O, TXDA and TXDB can be configured
either as input or output as determined by the TXDA and TXDB bits in
the MDDR. The TXDA and TXDB pins are enabled for SCI use by setting
the transmitter enable bit (TE) in SCCR1 of each SCI interface.
Pin Name Mnemonic
Transmit
Receive
Freescale Semiconductor, Inc.
data
data
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RXDA
RXDB
TXDA
TXDB
Signal Descriptions
Serial data output from SCIA (TE = 1)
Serial data output from SCIB (TE = 1)
Serial data input to SCIA (RE = 1)
Serial data input to SCIB (RE = 1)
Table 2-2. SCI Pins
Multichannel Communication Interface — Rev. 1.0
SCI Function
Table
2-2.
Port I/O Signal
MOTOROLA
PMC7
PMC5
PMC6
PMC4