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ATtiny261-ESSZ Scheda tecnica(PDF) 115 Page - ATMEL Corporation |
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ATtiny261-ESSZ Scheda tecnica(HTML) 115 Page - ATMEL Corporation |
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115 / 227 page  115 7753C–AVR–07/09 ATtiny261/ATtiny461/ATtiny861 16.11 Register Description 16.11.1 TCCR1A – Timer/Counter1 Control Register A • Bits 7,6 - COM1A1, COM1A0: Comparator A Output Mode, Bits 1 and 0 These bits control the behavior of the Waveform Output (OCW1A) and the connection of the Output Compare pin (OC1A). If one or both of the COM1A1:0 bits are set, the OC1A output overrides the normal port functionality of the I/O pin it is connected to. The complementary OC1B output is connected only in PWM modes when the COM1A1:0 bits are set to “01”. Note that the Data Direction Register (DDR) bit corresponding to the OC1A and OC1A pins must be set in order to enable the output driver. The function of the COM1A1:0 bits depends on the PWM1A, WGM10 and WGM11 bit settings. Table 16-6 shows the COM1A1:0 bit functionality when the PWM1A bit is set to Normal Mode (non-PWM). Table 16-7 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits are set to fast PWM mode. Bit 76543210 0x30 (0x50) COM1A1 COM1A0 COM1B1 COM1B0 FOC1A FOC1B PWM1A PWM1B TCCR1A Read/Write R/W R/W R/W R/W W W R/W R/W Initial value 00000000 Table 16-6. Compare Output Mode, Normal Mode (non-PWM) COM1A1..0 OCW1A Behavior OC1A Pin OC1A Pin 00 Normal port operation. Disconnected Disconnected 01 Toggle on Compare Match. Connected Disconnected 10 Clear on Compare Match. Connected Disconnected 11 Set on Compare Match. Connected Disconnected Table 16-7. Compare Output Mode, Fast PWM Mode COM1A1..0 OCW1A Behavior OC1A OC1A 00 Normal port operation. Disconnected Disconnected 01 Cleared on Compare Match. Set when TCNT1 = 0x000. Connected Connected 10 Cleared on Compare Match. Set when TCNT1 = 0x000. Connected Disconnected 11 Set on Compare Match. Cleared when TCNT1 = 0x000. Connected Disconnected |
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