MC33596 datasheet(21/58 Pages) FREESCALE

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Data Manager

MC33596 Data Sheet, Rev. 3

Freescale Semiconductor

11.4 Receiver Startup Delay

As shown in Figure 12, a settling time is required when entering the on state.

Figure 12. Receiver Usable Window

Data Manager

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

the data are output on the digital interface, in SPI format. This minimizes the load on the MCU.

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

•

ID detection: The received identifier is compared with the identifier stored in the ID register.

•

Header recognition: The received header is compared with the one stored in the HEADER

•

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

the shortest received pulse. During the reception of the telegram, the recovered clock is constantly

updated to the data rate of the incoming signal.

•

Output data and recovered clock on digital interface: See Section 14.1, “Receive Mode.”

•

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

Table 8 details some MC33596 features versus DME values.

Receiver On/Off Control

In receive mode, on/off sequencing can be controlled internally, or managed externally by the MCU

through the input pin STROBE.

If the internal timer is selected (SOE = 1),

Table 8.

the MC33596 Features versus DME

DME

Digital Interface Use

Data Format

Output

SPI deselected

Bit stream

No clock

MOSI

—

SPI master

when CONFB = 1

Data bytes

Recovered clock

MOSI

SCLK

Receiver

Status

Signal

Off

Settling

Time

Detected

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