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Freescale Semiconductor, Inc.
MC33593
STATE MACHINE WITH STROBE PIN CONTROL
Figure 16 details the state machine when the strobe oscillator is disabled (SOE=0).
Figure 16: State machine with STROBE pin control
State 6
Sleep mode
STROBE=1
SPI master
STROBE=0
STROBE=0
State 7
Run mode
Waiting for ID word
ID detected
State 8
Run mode
Send an ID word
HE=1
HE=0
STROBE=0
STROBE=0
STROBE=0
State 9
Run mode
Waiting for Header
Header received
State 10
Run mode
Output data & clock
EOM received
State 11
Run mode
Output data
State 6:
Programming SOE=0 sets ROMEO2 to state 6. The circuit is in Sleep mode.
State 7:
A high level applied on STROBE sets the circuit into state 7. If an ID or its complement is detected, the state
machine advances to state 8. If not, it will stay in state 7 as long as STROBE is high.
State 8:
After ID or its complement detection, ID byte is sent to the microcontroller on MOSI line at 310kBd. This warns
the microcontroller that data are received which means that an high level has to be maintained on STROBE. At
any time a low level applied on STROBE sets the circuit into state 6.
For More Information On This Product,
Go to: www.freescale.com
? Motorola, Inc., 2002.
MOTOROLA SEMICONDUCTORS PRODUCTS
15
revision 7.0, 5 February 2002
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