Rainbow-electronics ATAR862-8 User Manual download pdf (Page 85)

ATAR862-8

4589B–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 87. Frequency Measurement

Figure 88. 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.

0012345678910

ounter 3

TOG2

T3CP-

T3I

T3R

Capture value = 0 Capture value = 17

Capt. value = 18

11121314151617 1234567891011121314151617180 012345

0012345678910

Counter 3

TOG2

T3CP-

11 0 1 2 401

T3I

T3R

Capture value = 0 Capture value = 11

Cap. val. = 4

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 105 106

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Rainbow-electronics ATAR862-8 User Manual Page 85

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