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21 TCB - 16-bit Timer/Counter Type B
21.3 Functional Description
21.3.3 Operation
21.3.3.2 Output
If ASYNC in TCB.CTRLB is written to '0' ('1'), the output pin is driven synchronously (asynchronously) to the TCB clock. The bits CCMPINIT, CCMPEN, and CNTMODE in TCB.CTRLB control how the synchronous output is driven. The bits CCMPINIT, CCMPEN, and CNTMODE in TCB.CTRLB control how the synchronous output is driven. The different configurations and their impact on the output is listen in the table below.

tinyAVR 8-bit Microcontroller

21.3.3.2 Output

If ASYNC in TCB.CTRLB is written to '0' ('1'), the output pin is driven synchronously (asynchronously) to the TCB clock. The bits CCMPINIT, CCMPEN, and CNTMODE in TCB.CTRLB control how the synchronous output is driven. The bits CCMPINIT, CCMPEN, and CNTMODE in TCB.CTRLB control how the synchronous output is driven. The different configurations and their impact on the output is listen in the table below.

Table 21-3. Synchronous Output
CNTMODE	Output, CTRLB=’0’, CCMPEN=1	Output, CTRLB=’1’, CCMPEN=1
Single shot mode	Output high when counter starts and output low when counter stops	Output high when event arrives and output low when counter stops
8-bit PWM mode	PWM mode output	PWM mode output
Modes except single shot and PWM	Bit CCMPINIT in TCB.CTRLB	Bit CCMPINIT in TCB.CTRLB

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