MC33596FCESLASHR2 datasheet(21/70 Pages) FREESCALE

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Receive Mode

MC33596 Data Sheet, Rev. 4

Freescale Semiconductor

received, output data are complemented also. When an EOM occurs before the current byte is fully

shifted out, dummy bits are inserted until the number of shifted bits is a multiple of 8.

For all states: At any time, a low level applied to STROBE puts the circuit into state 20, and a low level

applied to CONFB forces the state machine to state 1, configuration mode.

11.2.4.3 Timing Definition

As shown in Figure 13, a settling time is required when entering the on state.

Figure 13. Receiver Usable Window

The goal for the receiver is to recognize at least one ID during Ton time. Many IDs are transmitted during

that time.

During Ton, the receiver should be able to detect an ID, but as receiver and transmitter are not

synchronized, an ID may already be transmitted when Ton time begins. That is the reason why Ton should

be sized to receive two IDs: to be sure to recognize one, no matter what the time difference between

beginning of transmission of the ID and beginning of run time for the receiver.

Ton should also include the setting time of the receiver. Setting time is composed of the crystal oscillator

wakeup time1, the PLL lock time2, and setup of all analog parameters3 (AGC and demodulator need some

time to settle).

Toff should be sized to allow the positioning of an on state during the transmission of the ID field.

During the setting time, no reception is possible.

11.3 Receiver On/Off Control

In receive mode, on/off sequencing can be controlled internally using the strobe oscillator, or managed

externally by the MCU through the input pin STROBE.

If the strobe oscillator is selected (SOE = 1):

•

Off time is clocked by the strobe oscillator

•

On time is clocked by the crystal oscillator, enabling accurate control of the on time, and therefore

of the current consumption of the whole system

1. Refer to parameter 5.10 found in Section 19.4, “PLL & Crystal Oscillator.”

2. Refer to parameter 5.9 found in Section 19.4, “PLL & Crystal Oscillator.”

3. Refer to preamble definition found in Figure 9.

Receiver

Status

Signal

Off

Setting

Time

Detected

Header

Data

EOM

Ton

Toff

Receiver

Status

Signal

Off

Setting

Time

Detected

Header

Data

EOM

Ton

Toff

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