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PIC18F23K20-E/ML Datasheet(PDF) 208 Page - Microchip Technology |
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PIC18F23K20-E/ML Datasheet(HTML) 208 Page - Microchip Technology |
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208 / 420 page ![]() PIC18F2XK20/4XK20 DS41303B-page 206 Advance Information © 2007 Microchip Technology Inc. 17.4.4.5 Clock Synchronization and the CKP bit When the CKP bit is cleared, the SCL output is forced to ‘0’. However, clearing the CKP bit will not assert the SCL output low until the SCL output is already sam- pled low. Therefore, the CKP bit will not assert the SCL line until an external I2C master device has already asserted the SCL line. The SCL output will remain low until the CKP bit is set and all other devices on the I2C bus have deasserted SCL. This ensures that a write to the CKP bit will not violate the minimum high time requirement for SCL (see Figure 17-12). FIGURE 17-12: CLOCK SYNCHRONIZATION TIMING SDA SCL DX – 1 DX WR Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 SSPCON1 CKP Master device deasserts clock Master device asserts clock |
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