参数资料
型号: ST5451D
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 1 CHANNEL(S), SERIAL COMM CONTROLLER, PDSO28
封装: SO-28
文件页数: 5/34页
文件大小: 269K
代理商: ST5451D
4- 2 - TRANSMIT FRAME
After polling bit XFW or after a XPR interrupt, up
to 32 bytes may be stored in XFIFO. Transmis-
sion begins after that XHF command is issued by
P. ST5451 will request another data block by an
XPR interrupt if the XFIFO contains less than 32
bytes.
When XME is set, all remaining XFIFO bytes are
transmitted, the CRC field and the closing flag are
added. The HDLC controller then generates a
new XPR interrupt.
If the XFIFO becomes empty while XME com-
mand has not been set, an abort sequence is
generated, followed by interframe time fill and
XDU interrupt is generated.
A frame may be aborted by XRES command as
well.
Figure 2: Transmission of an HDCL frame
ST5451
13/34
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