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MC9S12VR-Family - Data Sheet - Freescale Semiconductor

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f SCK /f bus<br />

1/2<br />

1/4<br />

5<br />

Figure K-3. Derating of maximum f SCK to f bus ratio in Master Mode<br />

<strong>MC9S12VR</strong> <strong>Family</strong> Reference Manual, Rev. 2.8<br />

SPI Electrical Specifications<br />

In Master Mode the allowed maximum f SCK to f bus ratio (= minimum Baud Rate Divisor, pls. see SPI Block<br />

Guide) derates with increasing f bus , please see Figure K-3..<br />

K.1.2 Slave Mode<br />

15 25 35<br />

10 20 30 40<br />

f bus [MHz]<br />

In Figure K-4. the timing diagram for slave mode with transmission format CPHA=0 is depicted.<br />

<strong>Freescale</strong> <strong>Semiconductor</strong> 551

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