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AN4099 Datasheet(PDF) 20 Page - STMicroelectronics

Part # AN4099
Description  Implementing transmitters and receivers for infrared remote control protocols using STM32F0xx and STM32F3xx microcontrollers
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4099 Datasheet(HTML) 20 Page - STMicroelectronics

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Infrared receiver
AN4099
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Doc ID 023110 Rev 2
3.3
RC5 protocol solutions
3.3.1
RC5 frame decoding mechanism
Figure 17 shows how the RC5 frame is received. One of the STM32 microcontroller’s
embedded peripherals is used for this purpose: TIMER configured in mode PWM input.
This input can capture the current timer value both at falling and rising edges as well as
generate an interrupt on both edges. This feature makes it easy to measure the RC5 pulse
high and low times.
Figure 17.
RC5 frame decoding mechanism
●
TIMER interrupt event: falling edge
A
: the TIMER interrupt is used to measure the period between two successive falling
edges (the entire pulse duration).
●
TIMER interrupt event: rising edge
B
: TIMER is used to measure the duration between the falling and rising edges (the low
pulse duration).
The two durations are used to determine the bit value. Each bit value is determined in
relation to the last bit.
SB
T= 1
0
bit1
bit2
bit3
bit4
b
No n I n v e r te d
RC 5 fr a m e
ca s e F B = 1
In v e r te d
RC 5 fr a m e :
IR m o d u le
ou tp u t
FB = 1



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