MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Guide de l'utilisateur télécharger pdf (Page 466)

100

101

Tar get Preferences

Number: SPRU721, available on the Texas Instruments

Web site.

Module clock prescaler

If Mode is

Master,conﬁgure the m odule clock frequency by

entering a value from 0–255.

Module clock frequency = I2C input clock frequency /(M odule

clock prescaler +1)

The I2C speciﬁcations require a m odule clo ck frequency

between 7 MHz and 12 MHz.

The I2C input clock frequency de pends on the D SP inp ut

clock frequency and the value of the PLL Control Register

divider (PLLCR). For more information on setting the

PLLCR, consult the documentation for your speciﬁc Digital

Signal Controller.

This Module clock prescaler corresponds to bits 7–0

(IPSC) of the I2C Prescaler Register (I2CPSC).

Master clock Low-time divider

When Mode is

Master, this divider determines the duration

ofthelowstateoftheSCLlineontheI2C-bus.

The low-time duration of the master clock = Tmod x (ICCL

+d).

For more information about this value, consult the “Formula

for the Master Clock Period” section in the TMS320x280x

Inter-Integrated Circuit Module Reference Guide,Literature

Number: SPRU721A, available on the Texas Instruments

Web site.

This parameter corresponds to bits 15–0 (ICCL) of the Clock

Low-Time Divider Register (I2CCLKL).

9-74

1 2 ... 461 462 463 464 465 466 467 468 469 470 471 ... 574 575

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MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Guide de l'utilisateur Page 466

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