ATMEGA640 datasheet(127/436 Pages) MICROCHIP

127 / 436 page

127

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

Note:

1. A special case occurs when OCR0A equals TOP and COM0A1 is set. In this case, the Compare Match is ignored,

but the set or clear is done at TOP. See “Phase Correct PWM Mode” on page 122 for more details.

• Bits 5:4 – COM0B1:0: Compare Match Output B Mode

These bits control the Output Compare pin (OC0B) behavior. If one or both of the COM0B1:0 bits are set, the

OC0B output overrides the normal port functionality of the I/O pin it is connected to. However, note that the Data

Direction Register (DDR) bit corresponding to the OC0B pin must be set in order to enable the output driver.

When OC0B is connected to the pin, the function of the COM0B1:0 bits depends on the WGM02:0 bit setting.

Table 16-5 shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to a normal or CTC mode (non-

PWM).

Table 16-6 shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to fast PWM mode.

Note:

1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case, the Compare Match is ignored,

but the set or clear is done at BOTTOM. See “Fast PWM Mode” on page 121 for more details.

Table 16-4.

Compare Output Mode, Phase Correct PWM Mode(1)

COM0A1

COM0A0

Description

Normal port operation, OC0A disconnected

WGM02 = 0: Normal Port Operation, OC0A Disconnected

WGM02 = 1: Toggle OC0A on Compare Match

Clear OC0A on Compare Match when up-counting. Set OC0A on Compare Match when

down-counting

Set OC0A on Compare Match when up-counting. Clear OC0A on Compare Match when

down-counting

Table 16-5.

Compare Output Mode, non-PWM Mode

COM0B1

COM0B0

Description

Normal port operation, OC0B disconnected

Toggle OC0B on Compare Match

Clear OC0B on Compare Match

Set OC0B on Compare Match

Table 16-6.

Compare Output Mode, Fast PWM Mode(1)

COM0B1

COM0B0

Description

Normal port operation, OC0B disconnected

Reserved

Clear OC0B on Compare Match, set OC0B at BOTTOM

(non-inverting mode)

Set OC0B on Compare Match, clear OC0B at BOTTOM

(inverting mode)

ATMEGA640 датащи(PDF) 127 Page - Microchip Technology

ATMEGA640 датащи(HTML) 127 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL