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AT90PWM2 Datasheet(PDF) 125 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 125 Page - ATMEL Corporation |
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125 / 365 page  125 AT90PWM2/3 4317B–AVR–02/05 16-bit Timer/Counter Register Description Timer/Counter1 Control Register A – TCCR1A • Bit 7:6 – COMnA1:0: Compare Output Mode for Channel A • Bit 5:4 – COMnB1:0: Compare Output Mode for Channel B The COMnA1:0 and COMnB1:0 control the Output Compare pins (OCnA and OCnB respectively) behavior. If one or both of the COMnA1:0 bits are written to one, the OCnA output overrides the normal port functionality of the I/O pin it is connected to. If one or both of the COMnB1:0 bit are written to one, the OCnB output overrides the normal port functionality of the I/O pin it is connected to. However, note that the Data Direction Reg- ister (DDR) bit corresponding to the OCnA or OCnB pin must be set in order to enable the output driver. When the OCnA or OCnB is connected to the pin, the function of the COMnx1:0 bits is dependent of the WGMn3:0 bits setting. Table 47 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to a Normal or a CTC mode (non-PWM). Table 48 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the fast PWM mode. Bit 7 6 5 4 321 0 COM1A1 COM1A0 COM1B1 COM1B0 – – WGM11 WGM10 TCCR1A Read/Write R/W R/W R/W R/W R R R/W R/W Initial Value 0 0 0 0 0 0 0 0 Table 47. Compare Output Mode, non-PWM COMnA1/COMnB 1 COMnA0/COMnB 0 Description 0 0 Normal port operation, OCnA/OCnB disconnected. 0 1 Toggle OCnA/OCnB on Compare Match. 1 0 Clear OCnA/OCnB on Compare Match (Set output to low level). 1 1 Set OCnA/OCnB on Compare Match (Set output to high level). Table 48. Compare Output Mode, Fast PWM(1) COMnA1/COMnB 1 COMnA0/COMnB 0 Description 0 0 Normal port operation, OCnA/OCnB disconnected. 0 1 WGMn3:0 = 14 or 15: Toggle OC1A on Compare Match, OC1B disconnected (normal port operation). For all other WGM1 settings, normal port operation, OC1A/OC1B disconnected. 1 0 Clear OCnA/OCnB on Compare Match, set OCnA/OCnB at TOP 1 1 Set OCnA/OCnB on Compare Match, clear OCnA/OCnB at TOP |
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