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Operation with Cascaded Connection

If bits CKS2 to CKS0 in either TCR0 or TCR1 are set to B’100, the 8-bit timers of the two

channels are cascaded. With this configuration, a single 16-bit timer could be used (16-bit timer

mode) or compare matches of the 8-bit channel 0 could be counted by the timer of channel 1

(compare match counter mode). In this case, the timer operates as below.

16-Bit Counter Mode:

When bits CKS2 to CKS0 in TCR0 are set to B'100, the timer functions

as a single 16-bit timer with channel 0 occupying the upper 8 bits and channel 1 occupying the

lower 8 bits.

Setting of compare match flags

The CMF flag in TCSR0 is set to 1 when a 16-bit compare match event occurs.

The CMF flag in TCSR1 is set to 1 when a lower 8-bit compare match event occurs.

Counter clear specification

If the CCLR1 and CCLR0 bits in TCR0 have been set for counter clear at compare match,

the 16-bit counter (TCNT0 and TCNT1 together) is cleared when a 16-bit compare match

event occurs. The 16-bit counter (TCNT0 and TCNT1 together) is cleared even if counter

clear by the TMRI0 pin has also been set.

The settings of the CCLR1 and CCLR0 bits in TCR1 are ignored. The lower 8 bits cannot

be cleared independently.

Control of output from the TMO0 pin by bits OS3 to OS0 in TCSR0 is in accordance with

the 16-bit compare match conditions.

Control of output from the TMO1 pin by bits OS3 to OS0 in TCSR1 is in accordance with

the lower 8-bit compare match conditions.

Compare Match Counter Mode:

When bits CKS2 to CKS0 in TCR1 are B'100, TCNT1 counts

compare match A’s for channel 0.

Channels 0 and 1 are controlled independently. Conditions such as setting of the CMF flag,

generation of interrupts, output from the TMO pin, and counter clear are in accordance with the

settings for each channel.

Note on Usage:

If the 16-bit counter mode and compare match counter mode are set

simultaneously, the input clock pulses for TCNT0 and TCNT1 are not generated and thus the

counters will stop operating. Software should therefore avoid using both these modes.

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