BL602/604 Reference Manual
The logic 1 and logic 0 waveforms of the NEC protocol are shown in the following figure:
1.12ms
2.25ms
560us
560us
560us
Logical”0”
Logical”1”
Figure 8.1: nec logical
Logic 1 is 2.25ms, pulse time is 560us; logic 0 bit is 1.12ms, pulse time is 560us.
The specific format of the NEC protocol is shown in the following figure:
9ms
4.5
ms
Command
MSB
LSB
Command
MSB
LSB
Address
MSB
LSB
Address
MSB
LSB
1
1
0
1
1
0
0
1
0
1
1
0
0
1
0
1
0
1
1
0
0
0
0
0
1
0
1
1
0
0
0
0
Figure 8.2: nec
The first pulse is a high-level pulse of 9ms and a low-level of 4.5ms, followed by an 8-bit address code and its inverse
code, and then an 8-bit command code and its inverse code. The tail pulse is 560us high and 560us low.
• RC-5 protocol
The logic 1 and logic 0 waveforms of the RC-5 protocol are shown in the following figure:
889us
889us
Logical”0”
Logical”1”
889us
889us
Figure 8.3: rc5 logical
Logic 1 is 1.778ms, which is 889us low and then 889us high; logic 0 and logic 1 have opposite waveforms.
The specific format of the RC-5 protocol is shown in the following figure:
BL602/604 Reference Manual
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