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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • Atmel   Atmel

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Combination Mode 10:
Frequency Measurement or
Event Counter with Time Gate
12-bit compare counter/8-bit compare counter and
4-bit prescaler
Timer 2 output mode 1/6: Timer 2 compare match toggles (TOG2) to the Timer 3
Timer 3 mode 3:
Timer/Counter; internal trigger restart and internal
capture (with Timer 2 TOG2-signal)
Timer 2 mode 1/2:
The counter is driven by an external (T3I) clock source. The output signal (TOG2) of
Timer 2 resets the counter. The counter value before reset is saved in the capture regis-
ter. If single-action mode is activated for one or both compare registers, the trigger
signal restarts also the single actions. This mode can be used for frequency measure-
ments or as event counter with time gate.
Figure 84.
Frequency Measurement
T3R
T3I
Counter 3
0 0 1 2 3 4 5 6 7 8 9 10 11121314151617 0 1 2 3 4 5 6 7 8 9 101112131415161718 0 1 2 3 4 5
TOG2
T3CP-
Register
Capture value = 0
Capture value = 17
Capt. value = 18
Figure 85.
Event Counter with Time Gate
T3R
T3I
Counter 3
TOG2
T3CP-
Register
Capture value = 0
Capture value = 11
Cap. val. = 4
0 0 1 2 3 4 5 6 7 8 9 10
11
0 1
2
3
4
0 1 2
Combination Mode 11:
Burst Modulation 1
Timer 2 mode 1/2:
12-bit compare counter/8-bit compare counter and
4-bit prescaler
Timer 2 output mode 1/6: Timer 2 compare match toggles the output flip-flop (M2)
to the Timer 3
Timer 3 mode 6:
Carrier frequency burst modulation controlled by Timer 2
output (M2)
The Timer 3 counter is driven by an internal or external clock source. Its compare and
compare mode registers must be programmed to generate the carrier frequency with
the output toggle flip-flop. The output toggle flip-flop (M2) of Timer 2 is used to enable
and disable the Timer 3 output. The Timer 2 can be driven by the toggle output signal of
Timer 3 (TOG3) or any other clock source.
86
T48C862-R8
4590B鈥?BMCU鈥?2/03

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