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Zakładka z wyszukiwarką danych komponentów |
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PIC16F877ATI/ML Arkusz danych(PDF) 93 Page - Microchip Technology |
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PIC16F877ATI/ML Arkusz danych(HTML) 93 Page - Microchip Technology |
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93 / 234 page  2003 Microchip Technology Inc. DS39582B-page 91 PIC16F87XA 9.4.4.5 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 9-12). FIGURE 9-12: 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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