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Output Compare

Output Compare. 2008/04/17. 暫存器. TMRy ： Timer y 的計數暫存器 PRy ： Timer y 的週期暫存器 OCxR ： 輸出比較主要暫存器 OCxRS ：輸出比較次要暫存器 OCxIF ： 輸出比較中斷旗標. 計數器. Timer2 Timer3. 輸出比較模式. OC1CONbits.OCM Single Compare Mode 比較符合設為 High (OC_LOW_HIGH) 比較符合設為 Low (OC_HIGH_LOW) 比較符合電位反轉 (OC_TOGGLE_PULSE)

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Output Compare

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  1. Output Compare 2008/04/17

  2. 暫存器 • TMRy：Timer y的計數暫存器 • PRy： Timer y的週期暫存器 • OCxR： 輸出比較主要暫存器 • OCxRS：輸出比較次要暫存器 • OCxIF： 輸出比較中斷旗標

  3. 計數器 • Timer2 • Timer3

  4. 輸出比較模式 • OC1CONbits.OCM • Single Compare Mode • 比較符合設為High (OC_LOW_HIGH) • 比較符合設為Low (OC_HIGH_LOW) • 比較符合電位反轉 (OC_TOGGLE_PULSE) • Dual Compare Mode • 單一脈衝 (OC_SINGLE_PULSE) • 連續脈衝 (OC_CONTINUE_PULSE) • Pulse-Wide Modulation (PWM) Mode • (OC_PWM_FAULT_PIN_DISABLE) • (OC_PWM_FAULT_PIN_ENABLE)

  5. Single Compare Mode • OC1CONbits.OCM = 0b001 • 將輸出初始化為Low • 比較符合時，將輸出設為High TMRy OCxR OCx OCxIF 2 Tcy

  6. Single Compare Mode • OC1CONbits.OCM = 0b010 • 將輸出初始化為High • 比較符合時，將輸出設為Low TMRy OCxR OCx OCxIF 2 Tcy

  7. Single Compare Mode • OC1CONbits.OCM = 0b011 • 比較符合時，將輸出反轉 TMRy OCxR OCx OCxIF 2 Tcy 使用者清除

  8. Dual Compare Mode • OC1CONbits.OCM = 0b100 • 碰到OCxR設為High，碰到OCxRS設為Low • 輸出產生單一脈衝 TMRy OCxRS OCxR OCx OCxIF 2 Tcy

  9. Dual Compare Mode • OC1CONbits.OCM = 0b101 • 輸出產生連續脈衝 TMRy OCxRS OCxR OCx OCxIF 2 Tcy

  10. Pulse-Wide Modulation (PWM) Mode • OC1CONbits.OCM = 0b110 or 0b111 • 比較符合時，將輸出設為Low • TMRy重置後，輸出設為High Period = (PRy + 1) Duty Cycle = (OCxRS ) TMRy OCxR OCx OCxIF

  11. Pulse-Wide Modulation (PWM) Mode • OCxR：Duty暫存器 • OCxRS：Duty緩衝暫存器 • 初始化時 • 將Duty寫入OCxRS • 將Duty初始值寫入OCxR • 輸出比較動作時 • 將下一週期的Duty寫入OCxRS • 週期開始時OCxR會讀入 OCxRS值

  12. EX13-2 ADCBUF0 != 0 • 連續脈衝模式 • PR2 = 0xE100 • OCxR = 0x0000, OCxRS = ADCBUF<<6 • 0x0000 < OCxRS < 0xFFC0 Period = (PR2 + 1) Duty Cycle = (OC1RS ) TMR2 OC1RS OC1R OC1

  13. EX13-2 ADCBUF0 = 0 ADCBUF0 = 0x0000 => OCxR = 0xFFFF, OCxRS = 0x0000 OC1R Period = (PR2 + 1) TMR2 OC1RS OC1

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