Clear To Send (Cts0); Request To Send (Rts0); Serial Peripheral Interface Module Signals; Spi Data Master Out/Slave In (Spi_Mosi) - Motorola M-CORE MMC2001 Series Reference Manual

4.9.3 Clear to Send (CTS0)

This active-low signal can be programmed as the clear-to-send output for UART
channel 0.
CTS0 is used to provide the PSTAT3 internal status signal when the PSTEN bit in the
EIM configuration register is set. In this case it operates as an active-high PSTAT3
output.

4.9.4 Request to Send (RTS0)

This active-low signal can be programmed as the request-to-send input for UART
channel 0.
RTS0 is used to provide the PSTAT2 internal status signal when the PSTEN bit in the
EIM configuration register is set. In this case it operates as an active-high PSTAT2
output.

4.10 Serial Peripheral Interface Module Signals

The following signals are used by the serial peripheral module. See SECTION 12
INTERVAL MODE SERIAL PERIPHERAL INTERFACE for more information on
these signals.

4.10.1 SPI Data Master Out/Slave In (SPI_MOSI)

This signal is the serial data output from the SPI in master mode and the serial data
input in slave mode.

4.10.2 SPI Data Master In/Slave Out (SPI_MISO)

This signal is the serial data input to the ISPI in master mode and the serial data out-
put in slave mode.

4.10.3 SPI Serial Clock (SPI_CLK)

This I/O signal is the serial shift clock for the SPI.
4.10.4 SPI Enable (SPI _EN)
This I/O signal is the peripheral chip select pin in master mode and is a slave enable
in slave mode.
4.10.5 SPI General-Purpose Output (SPI _GP)
This output signal is used as a general-purpose control signal for external logic or
devices.

4.11 Pulse Width Modulator Signals

See SECTION 15 PULSE WIDTH MODULATOR for more information on these sig-
nals.
MOTOROLA
4-8
Freescale Semiconductor, Inc.
SIGNAL DESCRIPTIONS
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MMC2001
REFERENCE MANUAL