Datasheet 搜索 > 微控制器 > ST Microelectronics（意法半导体） > STM32F100V8T6B 数据手册 > STM32F100V8T6B 开发手册 5/34 页
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STM32F100V8T6B 开发手册 - ST Microelectronics（意法半导体）
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ST Microelectronics（意法半导体）
分类:
微控制器
封装:
LQFP-100
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STMICROELECTRONICS STM32F100V8T6B 微控制器, 32位, 线路接入, ARM 皮质-M3, 24 MHz, 64 KB, 8 KB, 100 引脚, LQFP
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STM32F100V8T6B数据手册
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AN3174 RC5 protocol solutions
Doc ID 17249 Rev 2 5/34
3 RC5 protocol solutions
3.1 Protocol basics
The RC5 code is a 14-bit word, it uses bi-phase modulation (also called Manchester coding)
of a 36 kHz IR carrier frequency. All bits have an equal length of 1.778 ms, with half of the bit
time filled with a burst of the 36 kHz carrier and the other half being idle. A logical zero is
represented by a burst in the first half of the bit time. A logical one is represented by a burst
in the second half of the bit time. The duty cycle of the 36 kHz carrier frequency is 33% or
25% which reduces power consumption.
Figure 3. RC5 bit representation
The RC5 frame can generate 2048 (32x64) different commands organized on 32 groups.
Each group has 64 different commands. A RC5 frame contains the following fields. An
example of RC5 frame is shown in Figure 4.
● Start bit (S): 1 bit length, always logic 1.
● Field bit (F): 1 bit length, which denotes whether the command sent is in the lower field
(logic 1 = 0 to 63 decimal) or the upper field (logic 0 = 64 to 127 decimal). The field bit
was added later when it was realized that 64 commands per device were insufficient.
Previously, the field bit was combined with the start bit. Many devices still use this
original system.
● Control bit or Toggle bit (C): 1 bit length, which toggles each time a button is pressed.
This allows the receiving device to distinguish between two successive button presses
(such as "1", "1" for "11").
● Address: 5 bits length, that selects one of 32 possible systems.
● Command: 6 bits length, that (in conjunction with the field bit) represents one of the
128 possible RC5 commands.
S S S
,OGICAL@,OGICAL@
S
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