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ST92F124 数据表(PDF) 399 Page - STMicroelectronics |
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ST92F124 数据表(HTML) 399 Page - STMicroelectronics |
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399 / 429 page  399/429 ST92F124/F150/F250 - ELECTRICAL CHARACTERISTICS I2C/DDC-BUS TIMING TABLE (Cont’d) The following table gives the values to be written in the I2CCCR and I2CECCR registers to obtain the required I2C SCL line frequency. Table 70. SCL Frequency Table Legend: RP = External pull-up resistance fSCL = I 2C speed NA = Not achievable Note: – For speeds around 200 kHz, achieved speed can have ±5% tolerance – For other speed ranges, achieved speed can have ±2% tolerance The above variations depend on the accuracy of the external components used. fSCL (kHz) I2CCCR Value fCPU=12 MHz fCPU=24 MHz. VDD = 5 V RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ I2CECCR I2CCCR I2CECCR I2CCCR I2CECCR I2CCCR I2CECCR I2CCCR 400 0 86h 0 85h 0 8Fh 0 8Eh 300 0 89h 0 89h 0 95h 0 94h 200 0 90h 0 8Fh 0 A2h 0 A2h 100 0 36h 0 36h 0 71h 0 70h 50 0 72h 0 72h 0 64h 1 64h 1 |
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