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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • Atmel   Atmel

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T48C862-R8
Timer 3 鈥?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 pro-
grammable edge detector of the timer input stage. This mode can be used for signal and
pulse measurements.
Figure 60.
External Capture Mode
T3R
T3I
Counter 3
T3CP-
Register
0 0 1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526272829303132333435363738394041
Capture value = X
Capture value = 17
Capture
value = 35
Timer 3 Modulator for
Carrier Frequency Burst
Modulation
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 sup-
plied by the internal shift clock of the shift register.
Figure 61.
Modulator 3
0
TOG3
Set
T3
M3
1
2
T3O
Res
MUX
T3TOP
SO
M2
Timer 3 Mode
6
7
9
other
T3O
MUX 1
MUX 2
MUX 3
MUX 0
3
SSI/
Control
OMSK
T3M
Timer 3 Demodulator for
The demodulator stage of Timer 3 can be used to decode Biphase, Manchester and
Biphase, Manchester and
pulse-width-coded signals.
Pulse-width-modulated
Figure 62.
Timer 3 Demodulator 3
Signals
T3M
T3I
Demodulator 3
T3EX
Res
SCI
SI
CM31
Counter 3
Reset
Counter 3
Control
61
4590B鈥?BMCU鈥?2/03

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