312
9.5.2
A/D Converter Activation
The A/D converter can only be activated by channel 0 compare match A.
If the ADTE bit setting is 1 when the CMFA flag in 8TCSR0 is set to 1 by generation of channel 0
compare match A, an A/D conversion start request will be issued to the A/D converter. If the
TRGE bit in ADCR is 1 at this time, the A/D converter will be started. If the ADTE bit in
8TCSR0 is 1, A/D converter external trigger pin (
ADTRG
) input is disabled.
9.6
8-Bit Timer Application Example
Figure 9.17 shows how the 8-bit timer module can be used to output pulses with any desired duty
cycle. The settings for this example are as follows:
•
Clear the CCLR1 bit to 0 and set the CCLR0 bit to 1 in 8TCR so that 8TCNT is cleared by a
TCORA compare match.
•
Set bits OIS3, OIS2, OS1, and OS0 to (0110) in 8TCSR so that 1 is output on a TCORA
compare match and 0 is output on a TCORB compare match.
The above settings enable a waveform with the cycle determined by TCORA and the pulse width
detected by TCORB to be output without software intervention.
8TCNT
H'FF
Counter clear
TCORA
TCORB
H'00
TMO
Figure 9.17 Example of Pulse Output
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