參數(shù)資料
型號: CD1284
廠商: Intel Corp.
英文描述: IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
中文描述: 符合IEEE 1284兼容并行接口控制器兩個高速異步串行端口
文件頁數(shù): 63/176頁
文件大?。?/td> 2255K
代理商: CD1284
IEEE 1284-Compatible Parallel Interface Controller
CD1284
Datasheet
63
5.7.2
Non-UNIX
Receive Special Character Processing
In addition to UNIX special-character processing, the CD1284 provides other special character
recognition capabilities. The CD1284 has four registers that define special characters, SCHR1
SCHR4. SCHR1 and SCHR2, are used in flow-control activities and (see
Section 5.6
). SCHR3 and
SCHR4 define two additional special characters that the CD1284 can scan for in the receive data
stream. Recognition of special characters 3 and 4 are enabled by the SCD34 bit (COR3[6]). If
either of these characters are received, a special character detect (receive exception) service request
is sent. Note that if automatic in-band flow control is not enabled, SCHR1 and SCHR2 can still be
used as special characters. They are detected and reported as receive exceptions, but they do not
cause flow-control activities to be envoked.
The range detect function is another special character function. If this mode is enabled (COR3[7]
set), the CD1284 compares all received characters against the values in the SCRL and SCRH
registers. If the character received falls between these two values (inclusive), a special character
detect service request is posted.
The status shown in the RDSR indicates which of the special character recognition conditions were
met and caused the receive exception service request.
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