MC33596FCESLASHR2 datasheet(12/70 Pages) FREESCALE

12 / 70 page

MC33596 Data Sheet, Rev. 4

Receive Mode

Freescale Semiconductor

Receive Mode

The receiver is either waiting for an RF transmission or is receiving one. Two different processes are

possible, as determined by the values of the DME bit. A state diagram describes the sequence of operations

in each case.

NOTE

If the STROBE pin is tied to a high level before switching to receive mode,

the receiver does not go through an off or standby state.

11.1 Data Manager Disabled (DME=0)

Data manager disabled means that the SPI is deselected and raw data is sent directly on the MOSI line,

while SCLK remains at low level.

Two different processes are possible, as determined by the values of the SOE bit.

11.1.1 Data Manager Disabled and Strobe Pin Control

Raw received data is sent directly on the MOSI line. Figure 3 shows the state diagram.

Figure 3. Receive Mode, DME = 0, SOE = 0

•

State 5:

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 5b.

•

State 5b:

The receiver is kept on by the STROBE pin. Raw data is output on the MOSI line.

For all states: At any time, a low level applied to CONFB forces the state machine to state 1, configuration

mode.

STROBE = 0

STROBE = 1

SPI Deselected

STROBE = 1

State 5

Standby/LVD

State 5b

Raw Data on MOSI

STROBE = 0

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