T48C893 datasheet(69/82 Pages) ATMEL

69 / 82 page

T48C893

Rev. A4, 22-Jan-02

69 (82)

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; int. trigger restart & int. 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 register. 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 measurements or as

event counter with time gate.

0 0 12345678 9 10

Counter 3

TOG2

T3CP–

13879

T3I

T3R

Capture value = 0

Capture value = 17

Capture

value = 18

11121314151617

123456 789 101112131415161718

0123 45

Figure 80. Frequency measurements

00123456789 10

Counter 3

TOG2

T3CP–

13814

0 1

40 1

T3I

T3R

Capture value = 0

Capture value = 11

Capture

value = 4

Figure 81. 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.

010 1 2 3 450 1 0 1 234 5 0 1 0 12 3 4 5 0 10 1

5 010 1

5 0 1 0 1

5 0 10 1

5 0 1 0 1

5 0 10 1

5 0 1 0 1

5 0 10 1

5 0 1 0 1

CL3

Counter 3

CM1

CM2

TOG3

Counter 2/2

TOG2

T3O

13880

Figure 82. Burst modulation 1

T48C893 датащи(PDF) 69 Page - ATMEL Corporation

T48C893 датащи(HTML) 69 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82

датащи скачать

ссылки URL