请问 LPC812，用12 MHz internal RC oscillator trimmed to 1.5 % accuracy that can optionally be used as a system clock.

[hp20000]

在lpc11e6x芯片中的串口配置成支持CTS/RTS硬流控的，那么在和外部也支持硬流控的模块通讯的时候，需要注意什么？

[xiangjun_rong]

Hi, 平 汪 ,

关于您的问题， LPC812 的uart模块支持硬件流量控制， 从硬件上，你需要将LPC812的RTS 脚连接到对方的CTS脚， 将LPC812的CTS 脚连接到对方的RTS脚。

对于LPC812来讲， RTS是输出脚，Active low signal indicates that the USART0 is ready to receive data.

对于LPC812来讲， CTS是输入脚，Active low signal indicates that the external device that is in communication with the
USART is ready to accept data。

BR

XiangJun Rong

[hp20000]

您好！我想问一下LPC812，用12 MHz internal RC oscillator trimmed to 1.5 % accuracy that can optionally be used as a system clock.

该芯片的串口通信的时候，通信速率在115200b/s的时候，可以确保通信的稳定和可靠吗？

谢谢！

发件人: bounces+210748-fdb8-hp20000=126.com@jiveon.jivesoftware.com 代表 xiangjun.rong

发送时间: 2019年5月16日 17:32

收件人: 平 汪

主题: Re: - Re: 请问 LPC812，用12 MHz internal RC oscillator trimmed to 1.5 % accuracy that can optionally be used as a system clock.

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Re: 请问 LPC812，用12 MHz internal RC oscillator trimmed to 1.5 % accuracy that can optionally be used as a system clock.

reply from xiangjun.rong <https://community.nxp.com/people/xiangjun.rong?et=watches.email.thread> in LPC Microcontrollers - View the full discussion <https://community.nxp.com/message/1152450?commentID=1152450&et=watches.email.thread#comment-1152450>

[xiangjun_rong]

平 汪先生，

Uart模块通信的可靠性和稳定性取决于接收端和发送端实际波特率的一致性，举个例子，如果接收端和发送端用同样的时钟，即使这个时钟的精度有误差，也没有影响。

Pls download the MC56F844xxRM from the link and refer to section 34.4.4.5 Baud-Rate Tolerance, it describes the mismatch of the baudrate in detail.

Hope it can help you

BR

XiangJun Rong

[hp20000]

好的，谢谢！

发件人: bounces+210748-fdb8-hp20000=126.com@jiveon.jivesoftware.com 代表 xiangjun.rong

发送时间: 2019年5月21日 10:45

收件人: 平 汪

主题: Re: - Re: 请问 LPC812，用12 MHz internal RC oscillator trimmed to 1.5 % accuracy that can optionally be used as a system clock.

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Re: 请问 LPC812，用12 MHz internal RC oscillator trimmed to 1.5 % accuracy that can optionally be used as a system clock.

reply from xiangjun.rong <https://community.nxp.com/people/xiangjun.rong?et=watches.email.thread> in LPC Microcontrollers - View the full discussion <https://community.nxp.com/message/1154069?commentID=1154069&et=watches.email.thread#comment-1154069>