Freescale Semiconductor MCF52277 Reference Manual page 586

Synchronous Serial Interface (SSI)
Field
8 Transmitter underrun error 0. Similar description as TUE1 but pertains to TDE0 and it is not necessary to be in
TUE0 two-channel mode for this bit to be set.
0 No underrun detected
1 Transmitter 0 underrun error occurred
7 Transmit frame sync. Indicates occurrence of a transmit frame sync during transmission of the last word written to
TFS the SSI_TX registers
SSI Mode
Normal
Network
SSI Mode
Normal
Network
Note: Data written to the SSI_TX registers during the time slot when the TFS flag is set is sent during the second
time slot (in network mode) or in the next first time slot (in normal mode).
6 Receive frame sync. Indicates occurrence of a receive frame sync during reception of the next word in SSI_RX
RFS registers.
SSI Mode
Normal
Network
SSI Mode
Normal
Network
25-18
Table 25-8. SSI_ISR Field Descriptions (continued)
Required conditions
• SSI_IER[TIE] set
• SSI_IER[TFS] set
TFS is set when
• TFS is always set
• First time slot transmission
Required conditions
• SSI_IER[RIE] set
• SSI_IER[RFS] set
RFS is set when
• RFS is always set
• First time slot received
MCF52277 Reference Manual, Rev. 1
Description
Transmit frame sync interrupt
• SSI_ISR[TFS] sets
TFS is cleared when
any of the following occur
• SSI reset
• POR reset
• Starts transmitting next time slot
• SSI reset
• POR reset
Receive frame sync interrupt
• SSI_ISR[RFS] sets
RFS is cleared when
any of the following occur
• SSI reset
• POR reset
• Starts receiving next time slot
• SSI reset
• POR reset
Trigger
Trigger
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