Z85233 Datasheet, PDF (229/317 Pages) Zilog, Inc. – The Zilog SCC Serial Communication Controller

Application Note
Serial Communication Controller (SCC^™): SDLC Mode of Operation
SDLC TRANSMIT
Figure 1 shows the time chart for the transmitting SDLC
packet under interrupt control. When transmit is engaged,
data is shifted out of the transmitter on the falling edge of
the transmit clock. Transitions on the diagram are shown
coincident with TxCLK fall — in actual practice, there are
some associated delay times (which are specified in the
data sheet).
6-94
Figure 1. Typical SDLC Trsnsmission Sequence
UM010901-0601