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CHAPTER 14 16-BIT RELOAD TIMER
[External trigger mode (MOD2 to MOD0="001
B
", "010
B
", "011
B
")]
When the external trigger mode is set, the 16-bit reload timer is started by inputting the external valid edge
to the TIN pin. When the 16-bit reload timer is started, the value set in the 16-bit reload register (TMRLR)
is reloaded to the 16-bit timer register (TMR), starting the TMR count operation.
By setting the operating mode select bits in the timer control status register (TMCSR:MOD2 to MOD0),
the detected edge can be selected from the rising edge, falling edge, and both edges.
Note:
The trigger pulse width of the edge to be inputted to the TIN pin should be 2 T (T: machine cycles) or
more.
Figure 14.5-6 Count Operation in External Trigger Mode (One-shot Mode)
Figure 14.5-7 Count Operation in External Trigger Mode (Reload Mode)
Reload data
0000
H
-1
FFFF
H
Reload data
0000
H
-1
FFFF
H
2T to 2.5T
*
Counter clock
Counter
Data load signal
UF bit
CNTE bit
TIN pin
TOT pin
T: Machine cycle
* : It takes 2T to 2.5T time to load data of reload register from external trigger input.
Start trigger input wait
Reload data
0000
H
Reload data
0000
H
Reload data
0000
H
Reload data
2T to 2.5T
*
-1 -1 -1 -1
Counter clock
Counter
Data load signal
UF bit
CNTE bit
TIN pin
TOT pin
T : Machine cycle
* : It takes 2T to 2.5T time to load data of reload register from external trigger input.