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參數(shù)資料
| 型號(hào)： | 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)： | 4/12頁 |
| 文件大小： | 111K |
| 代理商： | 68HC05K0 |
MOTOROLA
4
AN463/D
Remote Control Operation
Figure 4
Flow diagram
setup ports
for keybrd
STOP
send end
message
NO
YES
YES
NO
interrupt
key still
pressed
send
message
send start
command
decode
read
keybrd
key
pressed
Figure 4
is a flow diagram showing the operation of
the remote control on power-up or reset. After the
initial set-up of the ports as inputs or outputs the
remote control goes into STOP mode. It will remain
in STOP mode as long as the device is not reset or
a key is not pressed. When a key is pressed an
interrupt request is generated. A short time delay
makes sure that it is a true key press and not noise
and also allows time for any switching effects on
the inputs to pass prior to checking the inputs.
The keyboard is then read to find which key has
been pressed and the code for the key is decoded
into an instruction and transmitted to the television.
If the key is held down the instruction is
re-transmitted until the key is released. This is
useful for the instructions which count through the
television channels or adjust the volume, colour or
brightness controls.
When the key is released a terminating instruction
is sent to the receiver to inform it that the next
message received is a separate instruction. This is
useful in the case of a one time instruction like
sending a channel number. In this example the
receiver will tune to a channel only once; to tune to
another channel the key must be released and a
new instruction sequence received.
After terminating the transmission the ports are
reset ready for the next key press and the
processor returns to the STOP mode.
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| 68HC05PL4 | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 68HC05PL4B | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 68HC705PL4 | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 68HC05K3DW | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| 68HC05K3P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| 68HC05L5 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:General Release Specification |
| 68HC05M68HC | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Microcontroller Unit |
| 68HC05P4A | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SPECIFICATION (General Release) |
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