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參數(shù)資料
| 型號： | FT232HL-REEL |
| 廠商： | FTDI, Future Technology Devices International Ltd |
| 文件頁數(shù)： | 28/65頁 |
| 文件大小： | 0K |
| 描述： | IC HS USB TO UART/FIFO 48LQFP |
| 應(yīng)用說明： | FT1248 Application Note |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 通道數(shù)： | 1，UART |
| FIFO's： | 4kb |
| 規(guī)程： | RS232，RS422，RS485 |
| 電源電壓： | 1.62 V ~ 1.98 V，2.97 V ~ 3.63 V |
| 帶并行端口： | 是 |
| 帶故障啟動位檢測功能： | 是 |
| 帶調(diào)制解調(diào)器控制功能： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | 768-1101-6 |
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Copyright 2012 Future Technology Devices International Limited
34
Document No.: FT_000288
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 1.8
Clearance No.: FTDI #199
4.7 Synchronous and Asynchronous Bit-Bang Interface Mode
The FT232H can be configured as a bit-bang interface. There are two types of bit-bang modes:
synchronous and asynchronous.
See application note AN2232-02 Bit Mode Functions for the FT232 for more details and examples of
using both Synchronous and Asynchronous bit-bang modes.
4.7.1
Asynchronous Bit-Bang Mode
Asynchronous Bit-Bang mode is the same as BM-style Bit-Bang mode, except that the internal RD# and
WR# strobes (RDSTB# and WRSTB#) are now brought out of the device to allow external logic to be
clocked by accesses to the bit-bang IO bus.
Any data written to the device in the normal manner will be self clocked onto the data pins (those which
have been configured as outputs). Each pin can be independently set as an input or an output. The rate
that the data is clocked out at is controlled by the baud rate generator.
New data must be written, and the baud rate clock should tick to change the data. If no new data is
written to the chip, the pins configured for output will hold the last value written.
Asynchronous Bit-Bang mode is enabled using the FT_SetBitMode D2xx driver command with a hex value
of 0x01.
4.7.2
Synchronous Bit-Bang Mode
The synchronous Bit-Bang mode will only update the output parallel port pins whenever data is sent from
the USB interface to the parallel interface. When this is done, the WRSTB# will activate to indicate that
the data has been read from the USB Rx FIFO buffer and written out on the pins. Data can only be
received from the parallel pins (to the USB Tx FIFO interface) after the parallel interface has been written
to.
With Synchronous Bit-Bang mode data will only be sent out by the FT232H if there is space in the
FT232H USB TXFIFO for data to be read from the parallel interface pins. This Synchronous Bit-Bang mode
will read the data bus parallel I/O pins first, before it transmits data from the USB RxFIFO. It is therefore
1 byte behind the output, and so to read the inputs for the byte that you have just sent, another byte
must be sent.
For example:
Figure 1.
Pins start at 0xFF
Send 0x55, 0xAA
Pins go to 0x55 and then to 0xAA
Data read = 0xFF,0x55
(2) Pins start at 0xFF
Send 0x55, 0xAA, 0xAA
(repeat the last byte sent)
Pins go to 0x55 and then to 0xAA
Data read = 0xFF, 0x55, 0xAA
Synchronous Bit-Bang Mode differs from Asynchronous Bit-Bang mode in that the device parallel output
is only read when the parallel output is written to by the USB interface. This makes it easier for the
controlling program to measure the response to a USB output stimulus as the data returned to the USB
interface is synchronous to the output data.
Synchronous Bit-Bang mode is enabled using Set Bit Bang Mode driver command with a hex value of
0x04.
An example of the synchronous bit-bang mode timing is shown in Figure 4.12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FT232HL-TRAY | 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| FT232HQ-REEL | 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C QFN-48 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| FT232HQ-TRAY | 功能描述:USB 接口集成電路 USB HS to UART/FIFO SPI/JTAG/I2C QFN-48 RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| FT232R | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB UART IC - Single chip USB to asynchronous serial data transfer interface |
| FT232R_10 | 制造商:FTDI 制造商全稱:FTDI 功能描述:USB UART IC - Single chip USB to asynchronous serial data transfer interface |
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