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參數(shù)資料
| 型號： | LPC47M112 |
| 廠商： | SMSC Corporation |
| 英文描述： | ENHANCED SUPER I/O CONTROLLER WITH LPC INTERFACE |
| 中文描述： | 增強的超級I / O控制器，LPC接口 |
| 文件頁數(shù)： | 77/228頁 |
| 文件大小： | 1269K |
| 代理商： | LPC47M112 |
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7.6 INFRARED INTERFACE
SMSC DS – LPC47M192
Page 77
Rev. 03/30/05
DATASHEET
The infrared interface provides a two-way wireless communications port using infrared as a transmission medium.
Two IR implementations have been provided for the second UART in this chip (logical device 5), IrDA and Amplitude
Shift Keyed IR. The IR transmission can use the standard UART2 TXD2 and RXD2 pins or optional IRTX2 and
IRRX2 pins. These can be selected through the configuration registers.
IrDA 1.0 allows serial communication at baud rates up to 115.2 kbps. Each word is sent serially beginning with a
zero value start bit. A zero is signaled by sending a single IR pulse at the beginning of the serial bit time. A one is
signaled by sending no IR pulse during the bit time. Please refer to the AC timing for the parameters of these pulses
and the IrDA waveform.
The Amplitude Shift Keyed IR allows asynchronous serial communication at baud rates up to 19.2K Baud. Each
word is sent serially beginning with a zero value start bit. A zero is signaled by sending a 500KHz waveform for the
duration of the serial bit time. A one is signaled by sending no transmission during the bit time. Please refer to the
AC timing for the parameters of the ASK-IR waveform.
If the Half Duplex option is chosen, there is a time-out when the direction of the transmission is changed. This time-
out starts at the last bit transferred during a transmission and blocks the receiver input until the timeout expires. If the
transmit buffer is loaded with more data before the time-out expires, the timer is restarted after the new byte is
transmitted. If data is loaded into the transmit buffer while a character is being received, the transmission will not
start until the time-out expires after the last receive bit has been received. If the start bit of another character is
received during this time-out, the timer is restarted after the new character is received. The IR half duplex time-out is
programmable via CRF2 in Logical Device 5. This register allows the time-out to be programmed to any value
between 0 and 10msec in 100usec increments.
The following figure shows the block diagram of the IR components in the LPC47M192:
ACE UART
IrDA SIR
Sharp ASK
COM
ACE
Registers
Output
MUX
IR
COM
Host Interface
IR Options Register,
Bit 6
IR Transmit Pins
The following description pertains to the TXD2/IRTX and IRTX2 pins of the LPC47M192.
Following a VTR POR, the IRTX and IRTX2 pins will be output and low. They will remain low until one of the
following conditions are met:
IRTX2/GP35 Pin. This pin defaults to the IRTX2 function.
1. This pin will remain low following a VCC POR until IRTX2 function is selected for the pin, serial port 2 is
enabled by setting the activate bit, at which time the pin will reflect the state of the transmit output of the
IR block (if IR is enabled through the IR Option Register for Serial Port 2).
2. This pin will remain low following a VCC POR until the GPIO output function is selected for the pin, at
which time the pin will reflect the state of the GPIO data bit if it is configured as an output.
GP53/TXD2(IRTX) Pin. This pin defaults to the GPIO output function.
1. This pin will remain low following a VCC POR until the TXD2 (IRTX) function is selected for the pin AND
serial port 2 is enabled by setting the activate bit, at which time the pin will reflect the state of the IR
transmit output of the IR block (if IR is enabled through the IR Option Register for Serial Port 2).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LPC47M112_07 | 制造商:SMSC 制造商全稱:SMSC 功能描述:Enhanced Super I/O Controller with LPC Interface |
| LPC47M112-MC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LPC47M112-MW | 功能描述:以太網(wǎng) IC Enhanced Super I/O Cntrl LPC Interface RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| LPC47M133-NC | 制造商:SMSC 功能描述: |
| LPC47M140-NC | 制造商:SMSC 制造商全稱:SMSC 功能描述:128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB |
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