T48C862-R8 datasheet(86/107 Pages) ATMEL

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T48C862-R8

4590B–4BMCU–02/03

Combination Mode 10:

Frequency Measurement or

Event Counter with Time Gate

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 (TOG2) to the Timer 3

Timer 3 mode 3:

Timer/Counter; internal trigger restart and internal

capture (with Timer 2 TOG2-signal)

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

Figure 85. Event Counter with Time Gate

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.

001 2345 6789 10

Counter 3

TOG2

T3CP-

T3I

T3R

Capture value = 0

Capture value = 17

Capt. value = 18

11121314151617

12 3 4 5 6789 101112131415161718

0 123 45

00 1 234 5 6 7 8 9 10

Counter 3

TOG2

T3CP-

0 1

40 1

T3I

T3R

Capture value = 0

Capture value = 11

Cap. val. = 4

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