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PIC16F-E/ML 数据表(PDF) 143 Page - Microchip Technology |
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PIC16F-E/ML 数据表(HTML) 143 Page - Microchip Technology |
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143 / 178 page ![]() © 2007 Microchip Technology Inc. DS40044F-page 141 PIC16F627A/628A/648A 17.5 Timing Parameter Symbology The timing parameter symbols have been created with one of the following formats: FIGURE 17-3: LOAD CONDITIONS 1. TppS2ppS 2. TppS T F Frequency T Time Lowercase subscripts (pp) and their meanings: pp ck CLKOUT osc OSC1 io I/O port t0 T0CKI mc MCLR Uppercase letters and their meanings: S FFall P Period HHigh R Rise I Invalid (High-impedance) V Valid L Low Z High-Impedance VDD/2 CL RL Pin Pin VSS VSS CL RL =464 Ω CL = 50 pF for all pins except OSC2 15 pF for OSC2 output Load Condition 1 Load Condition 2 |
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