MC33596FCESLASHR2 datasheet(20/70 Pages) FREESCALE

20 / 70 page

MC33596 Data Sheet, Rev. 4

Receive Mode

Freescale Semiconductor

Figure 12. Receive Mode, DME = 1, SOE = 0

•

State 20:

The receiver is in standby/LVD mode. For further information, see Section 12, “Standby: LVD

Mode.” A high level applied to STROBE forces the circuit to state 21.

•

State 21:

The circuit is waiting for a valid ID. If an ID, or its complement, is detected, the state machine

advances to state 22; if not, the state machine will remain in state 21, as long as STROBE is high.

•

State 22:

If a header, or its complement, is detected, the state machine advances to state 23. If not, the state

machine will remain in state 22, as long as STROBE is high.

•

State 23:

A header or its complement has been received; data and clock signals are output on the SPI port

until an EOM indicates the end of the data sequence. If the complement of the header has been

SPI Deselected

STROBE = 0

STROBE = 1

Header Received

EOM Received

and STROBE = 1

EOM Received

and STROBE = 0

ID Detected

State 20

Standby/LVD

State 21

Waiting For a Valid ID

State 22

Waiting for a Valid Header

State 23

Output Data and Clock

Waiting for End of Message

SPI Master

STROBE = 0

STROBE = 1

MC33596FCE/R2 Datasheet(PDF) 20 Page - Freescale Semiconductor, Inc