MCRF450 Ver la hoja de datos (PDF) - Microchip Technology
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MCRF450 Datasheet PDF : 50 Pages
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MCRF450/451/452/455
The following figures show the various modulation
patterns of the Fast Read commands (FRR and FRB).
Each command consists of a combination of five gap
pulses within nine possible gap positions. The pulse
width of each gap is 175 µs and the total time span of
each command for the nine possible positions is
1.575 ms (175 µs x 9 = 1.575 ms).
In the figures, Pmn represents mth gap pulse at nth gap
position in the given data packet (symbol).
FIGURE 6-3:
GAP MODULATION PATTERNS FOR FRR, NORMAL SPEED, TSMAX = 1
(µs)
1
(A) TCMAX = 1 0.5 P11
P22
P33
P44
0
200
400
600
800
P56
1000
1200
1400
1600
1
(B) TCMAX = 2 0.5 P11
P22
P33
P44
0
200
400
600
P55
800
1000
1
(C) TCMAX = 4 0.5
0
P11
P22
P33
200
400
600
P45
P56
800
1000
1200
1200
(µ s)
1400
1600
(µs)
1400
1600
FIGURE 6-4:
GAP MODULATION PATTERNS FOR FRR, FAST SPEED, TSMAX = 1
1
(A) TCMAX = 1 0.5 P11
0
200
P23
400
600
P35
P46
800
1000
(µs)
P58
1200
1400
1600
(µs)
1
(B) TCMAX = 2 0.5 P11
0
200
P23
400
600
P35
P46
P57
800
1000
1200
1400
1600
(µs)
1
(C) TCMAX = 4 0.5 P11
P23
P35
P47
P58
0
200
400
600
800
1000
1200
1400
1600
2003 Microchip Technology Inc.
DS40232H-page 25
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