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| 型号： | FT232HL-REEL |
| 厂商： | FTDI, Future Technology Devices International Ltd |
| 文件页数： | 28/65页 |
| 文件大小： | 0K |
| 描述： | IC HS USB TO UART/FIFO 48LQFP |
| 应用说明： | FT1248 Application Note |
| 标准包装： | 1 |
| 通道数： | 1，UART |
| FIFO's： | 4kb |
| 规程： | RS232，RS422，RS485 |
| 电源电压： | 1.62 V ~ 1.98 V，2.97 V ~ 3.63 V |
| 带并行端口： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 标准包装 |
| 其它名称： | 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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相关代理商/技术参数 |
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|---|---|
| FT232HL-TRAY | 功能描述:USB 接口集成电路 USB HS to UART/FIFO SPI/JTAG/I2C LQFP-48 RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| FT232HQ-REEL | 功能描述:USB 接口集成电路 USB HS to UART/FIFO SPI/JTAG/I2C QFN-48 RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| FT232HQ-TRAY | 功能描述:USB 接口集成电路 USB HS to UART/FIFO SPI/JTAG/I2C QFN-48 RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| FT232R | 制造商:FTDI 制造商全称:FTDI 功能描述:USB UART IC - Single chip USB to asynchronous serial data transfer interface |
| FT232R_10 | 制造商:FTDI 制造商全称:FTDI 功能描述:USB UART IC - Single chip USB to asynchronous serial data transfer interface |
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