Serial Port Infrared Timing
IRDA SIR RECEIVE
DATA
0
1
0
1
0
0
1
1
0
1
1
t2
t1
t2
t1
IRRX
n IRRX
Parameter
min
typ
max
units
t1 Pulse Width at
t1 Pulse Width at
t1 Pulse Width at
t1 Pulse Width at
t1 Pulse Width at
t1 Pulse Width at
t1 Pulse Width at
t2 Bit Time at
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.6
3.22
4.8
2.71
3.69
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
5.53
9.7
11.07
22.13
44.27
88.55
19.5
39
78
8.68
17.4
26
t2 Bit Time at
t2 Bit Time at
t2 Bit Time at
52
t2 Bit Time at
104
208
416
t2 Bit Time at
t2 Bit Time at
1. Receive Pulse Detection Criteria: A received pulse is considered
received pulse is a minimum of 1 41µs
2. IRRX: L5, CRF1 Bit 0
nIRRX: L5, CRF1 Bit 0 = 0
FIGURE 30 - IRDA SIR RECEIVE TIMING
254
SMSC [ SMSC CORPORATION ]
