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PIC18F4685-I/SP Datasheet(PDF) 209 Page - Microchip Technology |
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PIC18F4685-I/SP Datasheet(HTML) 209 Page - Microchip Technology |
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209 / 484 page  © 2007 Microchip Technology Inc. Preliminary DS39761B-page 207 PIC18F2682/2685/4682/4685 17.4.4.5 Clock Synchronization and the CKP bit When the CKP bit is cleared, the SCL output is forced to ‘0’. However, setting the CKP bit will not assert the SCL output low until the SCL output is already sampled 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 SSPCON CKP Master device deasserts clock Master device asserts clock |
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