參數(shù)資料
型號(hào)： XR88C681P/40-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 65/101頁(yè)
文件大?。?/td> 0K
描述： IC UART CMOS DUAL 40PDIP
標(biāo)準(zhǔn)包裝： 9
特點(diǎn)： *
通道數(shù)： 2，DUART
FIFO's： 1 字節(jié)，3 字節(jié)
電源電壓： 4.75 V ~ 5.25 V
帶并行端口： 是
帶CMOS： 是
安裝類型： 通孔
封裝/外殼： 40-DIP（0.600"，15.24mm）
供應(yīng)商設(shè)備封裝： 40-PDIP
包裝： 管件
其它名稱： 1016-1640
XR88C681P/40-F-ND
XR88C681
66
Rev. 2.11
In summary, for the “SET OUTPUT PORT BITS”
command;
Dn = 0; results in no change for OPR[n], nor Output Port
pin OPn.
Dn = 1; results in OPR[n] = “1”, and Output Port pin, OPn =
“0”
F.1.2 Clear Output Port Bits Command
The procedure for invoking this command is very similar
to that for “SET OUTPUT PORT BITS COMMAND”;
except in that the user now writes to DUART address 0F16
for [OP7,...,OP0].
For every “1” that is “written” to this address, the
corresponding bit in the OPR register is set to a logic “l(fā)ow”
and the corresponding Output Port pin, OPn is set to a
logic “high”. For every “0” that is written to this address,
the state of the corresponding OPR register bit, and in
turn the state of the Output Port pin is unchanged.
For Example:
Suppose that the contents of the Output Port Register,
OPR = [1, 1, 1, 1, 1, 1, 1, 1]. Consequently, the state of the
Output Port pins are:
[OP7, OP6, OP5, OP4, OP3, OP2, OP1, OP0] = [0, 0, 0, 0,
0, 0, 0, 0]
If we were to write [D7,...,D0] = [1, 1, 1, 1, 0, 0, 0, 0] to
DUART address 0F16, the resulting contents of the
Output Port register will be:
OPR[7:0] = [0, 0, 0, 0, 1, 1, 1, 1]
Further, the resulting state of the Output Port pins will be:
[OP7, OP6, OP5, OP4, OP3, OP2, OP1, OP0] = [1, 1, 1, 1,
0, 0, 0, 0]
This example of the “SET OUTPUT PORT BITS”
command is illustrated in
Figure 34.
Final OPR [7:0]
Data Bus, D7 - D0
DUART Address 0Fh
Figure 34. Illustration of the “CLEAR OUTPUT PORT BIT” Command and its Effect
on the Output Port Register and the State of the Output Port Pins.
State of the Output Port Pins (OP7-OP0)
Initial OPR [7:0]
1
0
In summary, for the “CLEAR OUTPUT PORT BITS”
command;
Dn = 0, results in no change for OPR[n] and no change in
the state of the Output Port pin, OPn.
Dn = 1, results in OPR[n] = 0, and sets the corresponding
Output Port pin to a logic “1”.
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