MC33596FCESLASHR2 datasheet(17/70 Pages) FREESCALE

17 / 70 page

11.2.3.3 HEADER

The HEADER defines the beginning of the message, as it is compared with the HEADER register. Its

length is variable, defined by the HDL[1:0] bits. The complement of the header is also recognized as the

header—in this case, output data is complemented. The header and its complement should not be part of

the ID.

The ID and the header are sent at the same data rate as data.

11.2.3.4 Data and EOM

The data must follow the header, with no delay.

The message is completed with an end-of-message (EOM), consisting of two consecutive NRZ ones or

zeroes (i.e., a Manchester code violation). Even in the case of FSK modulation, data must conclude with

an EOM, and not simply by stopping the RF transmission.

11.2.4 State Machine in Receive Mode When DME=1

When the strobe oscillator is enabled (SOE = 1), the receiver is continuously cycling on/off. The ID must

be recognized for the receiver to stay on. Consequently, the transmitted ID burst must be long enough to

include two consecutive receiver-on cycles.

When the strobe oscillator is not enabled (SOE = 0), these timing constraints must be respected by the

external control applied to pin STROBE.

Figure 11 shows the correct detection of an ID when STROBE is controled internally using the strobe

oscillator (SOE=1) or externally by the MCU (SOE=0).

Figure 10. Complete Transmission with ID Detection

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

11.2.4.1 Data Manager Enabled and Strobe Oscillator Enabled

Figure 11 shows the state diagram when the data manager and the strobe oscillator are enabled. In this

configuration, the receiver is controlled internally by the strobe oscillator. However, external control via

the STROBE pin is still possible, and overrides the strobe oscillator command.

Signal

Receiver

Status

SPI

Output

Preamble

Header

Data

EOM

Data

On Time

Off

Off Time

Detected

Off

ID Field

Signal

Receiver

Status

SPI

Output

Preamble

Header

Data

EOM

Data

On Time

Off

Off Time

Detected

Off

ID Field

MC33596FCE/R2 Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc

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