MC33596FCESLASHR2 datasheet(14/70 Pages) FREESCALE

14 / 70 page

MC33596 Data Sheet, Rev. 4

Receive Mode

Freescale Semiconductor

Figure 5. Typical Transfer in Receive mode with Data Manager

11.2.1 Data Manager Functions

In receive mode, Manchester coded data can be processed internally by the data manager. After decoding,

the data is available on the digital interface, in SPI format. This minimizes the load on the MCU.

The data manager, when enabled (DME = 1), has five purposes:

•

First ID detection: the received data are compared with the identifier stored in the ID register.

•

Then the HEADER recognition: the received data is compared with the data stored in the

HEADER register.

•

Clock recovery: the clock is recovered during reception of the preamble and is computed from the

shortest received pulse. While this signal is being received, the recovered clock is constantly

updated to the data rate of the incoming signal.

•

Output data and recovered clock on digital interface: see Figure 5.

•

End-of-message detection: an EOM consists of two consecutive NRZ ones or zeroes.

Table 6 details some MC33596 features versus DME values.

11.2.2 Manchester Coding Description

The MC33596 data manager is able to decode Manchester-coded messages. For other codings, the data

manager should be disabled (DME=0) for raw data to be available on MOSI.

Table 6.

the MC33596 Features versus DME

DME

Digital Interface Use

Data Format

Output

SPI deselected, received data

are directly sent to MOSI

when CONFB = 1

Bit stream

No clock

MOSI

—

SPI master, data sent on

MOSI with clock on SCLK

when CONFB = 1

Data bytes

Recovered clock

MOSI

SCLK

SEB

STROBE

SCLK

(Output)

MOSI

(Output)

Recovered Clock Updated to Incoming Signal Data Rate

D6 D5 D4 D3 D 2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

CONFB 1

D6 D 5 D4 D3 D2 D1

*Refer to

(Section 10) SEB

STROBE

SCLK

(Output)

MOSI

(Output)

Recovered Clock Updated to Incoming Signal Data Rate

D6 D5 D4 D3 D 2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

CONFB 1

D6 D 5 D4 D3 D2 D1

*Refer to

(Section 10)

MC33596FCE/R2 Datasheet(PDF) 14 Page - Freescale Semiconductor, Inc

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