tmp88f846ug TOSHIBA Semiconductor CORPORATION, tmp88f846ug Datasheet - Page 98

• Manufacturer Part Number: tmp88f846ug
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

11.1 Configuration
11. 16-Bit Timer (CTC)
11.3.2 Timer mode with external trigger start
selected with CTC1CR1<CTC1SE>). The source clock is an internal clock. For successive cycles, when the
counter value and the set value of the CTC1DRA Register match, an INTCTC1 interrupt is generated and the
counter is cleared and then restarted. The counter is stopped by a trigger input on CTC pin and restarted by the
next trigger input. For a one-shot cycle, when the counter value and the set value of the CTC1DRA Register
match, an INTCTC1 interrupt is generated and the counter is cleared and stopped. The counter restarts count-
ing up by input on CTC pin. When CTC1CR1<CTC1E> = 1, the counter is cleared and stops counting at an
edge on CTC pin input opposite the active edge that triggers the counter to start counting. In this mode, an
interrupt can be generated by entering a pulse which has a certain width. When CTC1CR1<CTC1E> = 0,
opposite edges on CTC input are ignored.
In this timer mode, the timer/counter starts counting as triggered by input on CTC pin (rising or falling edge
(I) When rising edge start is selected, with counting enabled on one edge
a) Successive
b) One Shot
CTC pin input
Internal clock
Counter
Timer
Register A
INTCTC1
interrupt
CTC pin input
Internal clock
Counter
Timer
Register A
INTCTC1
interrupt
( CTC1SE = 0, CTC1E = 0 )
Figure 11-3 External Trigger Mode Timing Chart
Count start
Count start
0
0
Trigger
Trigger
n
n
1
1
2
2
n - 1
n - 1
Successive
One Shot
Page 88
n
n
Clear
1
Stop
0
2
Count start
3
Trigger
Stop
4
1
Trigger
2
3
4
Count start
1
5
Trigger
2
6
TMP88F846UG