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PIC18F258-E/SOSQTP 数据表(PDF) 139 Page - Microchip Technology |
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PIC18F258-E/SOSQTP 数据表(HTML) 139 Page - Microchip Technology |
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139 / 402 page  © 2006 Microchip Technology Inc. DS41159E-page 137 PIC18FXX8 16.5.3 FULL-BRIDGE MODE In Full-Bridge Output mode, four pins are used as out- puts; however, only two outputs are active at a time. In the Forward mode, pin RD4/PSP4/ECCP1/P1A is con- tinuously active and pin RD7/PSP7/P1D is modulated. In the Reverse mode, RD6/PSP6/P1C pin is continu- ously active and RD5/PSP5/P1B pin is modulated. These are illustrated in Figure 16-5. P1A, P1B, P1C and P1D outputs are multiplexed with the PORTD<4:7> data latches. The TRISD<4:7> bits must be cleared to make the P1A, P1B, P1C and P1D pins output. FIGURE 16-5: FULL-BRIDGE PWM OUTPUT Period Duty Cycle P1A(2) P1B(2) P1C(2) P1D(2) FORWARD MODE (1) Period Duty Cycle P1A(2) P1C(2) P1D(2) P1B(2) REVERSE MODE (1) (1) (1) Note 1: At this time, the TMR2 register is equal to the PR2 register. Note 2: Output signal is shown as asserted high. |
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