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參數(shù)資料
| 型號： | 68HC05K0 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 111K |
| 代理商： | 68HC05K0 |
AN463/D
MOTOROLA
3
A complete transmission command consists of
several messages. Each command begins with a
start message of nine 1’s followed by the message
appropriate to the key pressed. This message is
repeatedly transmitted until the key is released.
The transmission is terminated after the key is
released by a end message of nine 1’s.
Every message consists of a pre-bit, a pre-bit
pause, a start bit and nine data bits. The pre-bit and
the start-bit are always logical ‘1’. The pre-bit allows
for the set up of the automatic gain control in the
receiving preamplifier.
Figure 3
gives the exact
timing relationships for the transmissions.
The command timing in
Figure 3
shows that after the
start transmission the message is continually
re-transmitted at intervals of 131ms (approximately
8Hz) until the key is released. This is shown as time
(c). The control timing shows the nine bit instruction
111001110 being transmitted starting with the LSB.
The pre-bit pause is equal to two bit periods and is
followed by a start-bit of logical ‘1’. The pulse train is
continuous
during
the
transmitting a logic ‘0’ and a logic ‘1’. The modulating
pulse train has a frequency of approximately 32kHz
with a mark-to-space ratio of one to three.
transition
between
The signal for transmission is output through one port
pin and is used to drive an IR diode amplifier circuit.
Command timing
(a) = 32.8ms
(b) = 13.3ms
(c) = 131ms
start transmission
start command
control transmission
13 * bit time
Message timing
(d) = 512
(e) = 1.024ms
(f) = 3.072ms
μ
s
(half-bit time)
(bit time)
(pre-pulse time)
16/fcarrier
Modulation
(g) = 8
(h) = 32
(i) = 512
μ
s
μ
μ
s
s
(1/fcarrier)
(half-bit time)
16/fcarrier
Figure 3
Circuit timing
(1)
(1)
(0)
(1)
(1)
(1)
(0)
(0)
(1)
(1)
(1)
(a)
(b)
(b)
(c)
(d)
(d)
(d)
(e)
(e)
(f)
(g)
(g)
(h)
(i)
(c)
COMMAND TIMING
START TRANSMISSION
MESSAGE TIMING
MODULATION
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