MC33593

MOTOROLA SEMICONDUCTORS PRODUCTS

16

revision 7.0, 5 February 2002

© Motorola, Inc., 2002.

State 9:

If Header or its complement is detected, the state machine advances to state 10. If not, it will stay in state 9 as

long as STROBE is high.

State 10:

If Header has been received, data and clock signals are output on the SPI port. If the complement of Header has

been received, output data are complemented too. At any time a low level applied on STROBE sets the circuit

into state 6, after the current byte is fully transmitted.

State 11:

If data are received after a End of Message they are output on the MOSI pin without clock recovery.

For all states:

At any time, a low level applied on RESETB for more than one Ts forces the state machine to state 1. When the

transition condition from one state to the next one is fulfilled, the transition time is one Ts except reaching state 6.

The transition time for reaching state 6 is 2

low when in state 10).

STROBE OSCILLATOR

The Strobe Oscillator is a relaxation oscillator in which an external capacitor C5 is charged by an external

resistance R2 (refer to figure 17 and table 11). When a threshold is reached or exceeded C5 is discharged and

The circuit may be forced into states 0b, 3, 7 etc. (see State Machine Diagrams) by setting the STROBE pin to

current which must be supplied.

Freescale Semiconductor, Inc.

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