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參數(shù)資料
| 型號： | VV6501 |
| 廠商： | 意法半導體 |
| 英文描述： | DUAL-MODE DIGITAL CAMERA CO-PROCESSOR |
| 中文描述： | 雙模式數(shù)字相機協(xié)處理器 |
| 文件頁數(shù)： | 22/44頁 |
| 文件大?。?/td> | 351K |
| 代理商： | VV6501 |
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STV0681 Hardware Interfaces
STV0681
22/44
ADCS 7283313C
4.4
UART module for RS232 interface
The UART module on STV0681 provides a 115200 baud full duplex serial interface to an external
host.
4.4.1
RS232 physical interface
STV0681 does not support direct connection to a RS232 serial link. Physical line driver circuitry is
required, e.g. using a standard RS232 transceiver chip, or by using a small number of low cost
discretes (refer to Reference Design for details). Unscreened cable can be used, a suitable low cost
connector is a 3.5mm stereo audio jack plug.
4.4.2
UART module overview
Receiving data
The UART module in STV0681 receives serial data through the RXD pin. Data reception is initiated
by a 1-to-0 transition on RXD, and the received data is sampled every 8.66
μ
s.
If the RXD input is not 0 when the incoming data is first sampled, the UART module goes back to
look for another 1-to-0 transition. This is to provide rejection of false start bits. If the start bit proves
valid, reception of the rest of the frame proceeds.
Transmitting data
When a transmission is activated by STV0681, the contents of an internal transmit shift register are
shifted onto the TXD pin, every 8.66
μ
s.
The UART operates at 12MHz, which is not an integer multiple of 115200, so the actual baud rate is
115232 +/- 0.3%, which is well within the requirements of a typical 16x oversampling UART, which
can tolerate a 3.75% error in baud rate.
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