ATAM894X-TNQY ATMEL [ATMEL Corporation], ATAM894X-TNQY Datasheet - Page 54

• Manufacturer Part Number: ATAM894X-TNQY
• Description: 8k-flash Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

6.3.3.4
54
ATAM894
Timer 3 Modulator for Carrier Frequency Burst Modulation
Timer 3 – Mode 12: Timer/Counter with External Capture Mode (T3I)
The counter is driven by an internal clock source and an edge at the external input T3I loads the
counter value into the capture register. The edge can be selected with the programmable edge
detector of the timer input stage. This mode can be used for signal and pulse measurements.
Figure 6-35. External Capture Mode
If the output stage operates as pulse-width modulator for the shift register the output can be
stopped with stage 1 of Timer 2. For this task, the timer mode 3 must be used and the prescaler
must be supplied by the internal shift clock of the shift register.
The modulator can be started with the start of the shift register (SIR = 0) and stopped either by a
shift register stop (SIR = 1) or compare match event of stage 1 of Timer 2. For this task, the
Timer 2 must be used in mode 3 and the prescaler stage must be supplied by the internal shift
clock of the shift register.
Figure 6-36. Modulator 3
Counter 3
Register
T3CP-
T3R
T3I
Control
TOG3
SSI/
M2
SO
0
0 1 2 3 4 5 6 7 8 9 1011
Set Res
T3TOP
T3
Capture value = X
M3
OMSK
12 13 14
15
0
1
3
2
16
1718 19
MUX
T3M
20
21
22
T3O
Capture value = 17
23
24 2526
27
Timer 3 Mode
28
29
30
3132 33
other MUX 0
34
6 MUX 1
7 MUX 2
9 MUX 3
35
Capture value = 35
36
T3O
37
4679D–4BMCU–05/05
3839 40
41