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ATtiny261A Datasheet(PDF) 112 Page - ATMEL Corporation |
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ATtiny261A Datasheet(HTML) 112 Page - ATMEL Corporation |
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112 / 292 page  112 8197A–AVR–10/09 ATtiny261A/461A/861A • Bits 5,4 - COM1B1, COM1B0: Comparator B Output Mode, Bits 1 and 0 These bits control the behaviour of the Waveform Output (OCW1B) and the connection of the Output Compare pin (OC1B). If one or both of the COM1B1:0 bits are set, the OC1B 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 COM1B1:0 bits are set to “01”. Note that the Data Direction Register (DDR) bit corresponding to the OC1B pin must be set in order to enable the output driver. The function of the COM1B1:0 bits depends on the PWM1B and WGM11:10 bit settings. Table 12-13 shows the COM1B1:0 bit functionality when the PWM1B bit is set to Normal Mode (non- PWM). Table 12-14 shows the COM1B1:0 bit functionality when the PWM1B and WGM11:10 bits are set to Fast PWM Mode. Table 12-15 shows the COM1B1:0 bit functionality when the PWM1B and WGM11:10 bits are set to Phase and Frequency Correct PWM Mode. Bits COM1B1 and COM1B0 are shadowed in TCCR1C. Writing to bits COM1B1 and COM1B0 will also change bits COM1B1S and COM1B0S in TCCR1C. Similary, changes written to bits Table 12-13. Compare Output Mode, Normal Mode (non-PWM) COM1B1:0 OCW1B Behaviour OC1B Pin OC1B 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 12-14. Compare Output Mode, Fast PWM Mode COM1B1:0 OCW1B Behaviour OC1B Pin OC1B Pin 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 Table 12-15. Compare Output Mode, Phase and Frequency Correct PWM Mode COM1B1:0 OCW1B Behaviour OC1B Pin OC1B Pin 00 Normal port operation. Disconnected Disconnected 01 Cleared on Compare Match when up-counting. Set on Compare Match when down-counting. Connected Connected 10 Cleared on Compare Match when up-counting. Set on Compare Match when down-counting. Connected Disconnected 11 Set on Compare Match when up-counting. Cleared on Compare Match when down-counting. Connected Disconnected |
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