Filter
Top Products
261
CHAPTER 14 16-BIT RELOAD TIMER
■ Operation in Event Count Mode
The operation of the 16-bit reload timer is enabled by setting the timer operation enable bit in the timer
control status register (TMCSR:CNTE) to 1. When the software trigger bit in the timer control status
register (TMCSR:TRG) is set to 1, the 16-bit reload timer is started. 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. After the 16-bit reload timer is started, the edge of the external event clock input
to the TIN pin is detected to perform 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 level width of the external event clock to be inputted to the TIN pin should be 4 T (T: machine
cycles) or more.
Figure 14.5-10 Count Operation in Event Count Mode (One-shot Mode)
Figure 14.5-11 Count Operation in Event Count Mode (Reload Mode)
Reload data
0000
H
T
*
-1
FFFF
H
Reload data
0000
H
-1
FFFF
H
Counter
Data load signal
UF bit
CNTE bit
TOT pin
T : Machine cycle
* : It takes 1 T time to load data of reload register from trigger input.
Start trigger input wait
TRG bit
TIN pin
Reload data
0000
H
Reload data
0000
H
Reload data
0000
H
Reload data
T
*
-1 -1 -1 -1
Counter
Data load signal
UF bit
CNTE bit
TIN pin
TOT pin
T : Machine cycle
* : It takes 1 T time to load data of reload register from trigger input.
TRG bit