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CHAPTER 11 MULTIFUNCTIONAL TIMER
■ Selected External Count Clock
The 16-bit free-run timer is incremented based on the input clock (internal clock or external clock). When
an external clock is selected, then after external clock mode is selected (TCCSH register's ECKE: bit15=1),
the 16-bit free-run timer starts counting up on a rising edge if the initial value of external input is "1".
Subsequently, it counts up on both edges. If the initial value of external input is "0", it starts counting up on
a falling edge. Subsequently, it counts up on both edges.
External clock input
TCCSH: ECKE bit
Count clock
Count value
■ A/D Activation Via Free-run Timer
It is possible to activate A/D1 and A/D2 upon a compare match or 0 detection of the 16-bit free-run timer.
The activation trigger can be selected by means of the A/D trigger cause selection bit (SEL1 and SEL2:
bit2 and bit3) of the A/D trigger control register (ADTRGC).
It is possible to halt A/D activation signals, even upon compare match or 0 detection, via the A/D trigger
output enable/disable bits (AD1E and AD2E: bit0 and bit1) of the A/D trigger control register (ADTRGC).
Note:
When A/D activation signal output is disabled, if A/D activation signal output is enabled, then when
an activation trigger compare match or 0-detection is outputted, the A/D activation signal will be
outputted at the same time that the authorization is made.
266
Figure 11.6-10 Count Timing of 16-bit Free-run Timer
N
N+1
N+2
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