Ssi Data And Control Pins - Freescale Semiconductor 56F800 User Manual

12.5 SSI Data and Control Pins

The SSI has the following dedicated pins:
• Serial Transmit Data (SSI_TXD_OUT)
• Serial Transmit Data Enable (SSI_TXD_OEN)
• Serial Receive Data (SSI_RXD)
• Serial Transmit Clock Out (SSI_TCK_OUT)
• Serial Transmit Clock In (SSI_TCK_IN)
• Serial Transmit Clock Enable (SSI_TCK_OEN)
• Serial Transmit Frame Sync Out (SSI_TFS_OUT)
• Serial Transmit Frame Sync In (SSI_TFS_IN)
• Serial Transmit Frame Sync Enable (SSI_TFS_OEN)
• Serial Receive Clock Out (SSI_RCK_OUT)
• Serial Receive Clock In (SSI_RCK_IN)
• Serial Receive Clock Enable (SSI_RCK_OEN)
• Serial Receive Frame Sync Out (SSI_RFS_OUT)
• Serial Receive Frame Sync In (SSI_RFS_IN)
• Serial Receive Frame Sync Enable (SSI_RFS_OEN)
Figure 12-21 and Figure 12-22
transmit and receive functions with a continuous or gated clock, as shown.
Note: Gated clock implementations do not require the use of the frame sync pins. In this case
these pins can be used as GPIO pins, if desired.
Note: This GPIO is a separate module itself, multiplexing and connecting the SSI data and
control signals to the six dedicated I/O pins for SSI.
Freescale Semiconductor
exhibit the main SSI configurations. These pins support all
Synchronous Serial Interface (SSI), Rev. 3
SSI Data and Control Pins
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