Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller TSSOP 20 8-Bit 16 MHz I/O number 16

131

132

133

134

135

136

137

138

139

140

133

7728G–AVR–06/10

ATtiny87/ATtiny167

Table 12-2 shows the COM1A/B1:0 bit functionality when the WGM13:0 bits are set to the fast

PWM mode.

Note: 1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is set. In

this case the compare match is ignored, but the set or clear is done at TOP. See “Fast PWM

Mode” on page 124. for more details.

Table 12-3 shows the COM1A/B1:0 bit functionality when the WGM13:0 bits are set to the

phase correct or the phase and frequency correct, PWM mode.

Note: 1. A special case occurs when OC1A/OC1B equals TOP and COM1A1/COM1B1 is set. See

“Phase Correct PWM Mode” on page 126. for more details.

• Bit 3:2 – Reserved Bits

These bits are reserved for future use.

Table 12-2. Compare Output Mode, Fast PWM

(1)

OC1Ai

OC1Bi

COM1A1

COM1B1

COM1A0

COM1B0 Description

0x x

Normal port operation, OC1A/OC1B disconnected.

10 0

10 1

WGM13=0: Normal port operation, OC1A/OC1B

disconnected.

WGM13=1: Toggle OC1A on Compare Match, OC1B

reserved.

11 0

Clear OC1A/OC1B on Compare Match

Set OC1A/OC1B at TOP

11 1

Set OC1A/OC1B on Compare Match

Clear OC1A/OC1B at TOP

Table 12-3. Compare Output Mode, Phase Correct and Phase and Frequency Correct

PWM

(1)