![](http://datasheet.mmic.net.cn/90000/M44C892_datasheet_3496865/M44C892_68.png)
M44C892
M44C092
Rev. A5, 14-Dec-01
68 (84)
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–
Register
13879
T3I
T3R
Capture value = 0
Capture value = 17
Capture
value = 18
11121314151617
123456 789 101112131415161718
0
0123 45
Figure 80. Frequency measurements
00123456789 10
Counter 3
TOG2
T3CP–
Register
13814
11
0 1
2
40 1
T3I
2
3
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
30
1
2
3
0
1
3
2
CL3
Counter 3
CM1
CM2
TOG3
M3
Counter 2/2
TOG2
M2
T3O
13880
Figure 82. Burst modulation 1