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PIC16F720-E/ML датащи(PDF) 157 Page - Microchip Technology |
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PIC16F720-E/ML датащи(HTML) 157 Page - Microchip Technology |
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157 / 244 page ![]() 2010 Microchip Technology Inc. DS41430A-page 157 PIC16F/LF720/721 17.2.10 CLOCK SYNCHRONIZATION When the CKP bit is cleared, the SCL output is held low once it is sampled low. Therefore, the CKP bit will not stretch the SCL line until an external I2C master device has already asserted the SCL line low. The SCL output will remain low until the CKP bit is set and all other devices on the I2C bus have released SCL. This ensures that a write to the CKP bit will not violate the minimum high time requirement for SCL (Figure 17-14). 17.2.11 SLEEP OPERATION While in Sleep mode, the I2C module can receive addresses of data, and when an address match or complete byte transfer occurs, wake the processor from Sleep (if SSP interrupt is enabled). FIGURE 17-14: 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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