Fundamentals of Digital Logic and Microcomputer Design |
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Sayfa 368
port can be individually configured as either input or output . For the other type ,
all bits in the port can be set up as all parallel input or output bits . Each port can
be configured as an input or output port by another register called the “ command
...
port can be individually configured as either input or output . For the other type ,
all bits in the port can be set up as all parallel input or output bits . Each port can
be configured as an input or output port by another register called the “ command
...
Sayfa 402
Consider fixed port addressing , in which the 8 - bit port address is directly
specified as part of the instruction . IN AL , 38H inputs 8 - bit data from port 38H
into AL . IN AX , 38H inputs 16 - bit data from ports 38H and 39H into AX . OUT
38H , AL ...
Consider fixed port addressing , in which the 8 - bit port address is directly
specified as part of the instruction . IN AL , 38H inputs 8 - bit data from port 38H
into AL . IN AX , 38H inputs 16 - bit data from ports 38H and 39H into AX . OUT
38H , AL ...
Sayfa 461
Port addresses for the odd 8255 Port A = F9H Port B = FBH Port C = FDH Control
Register = FFH Even Odd Table 9 . 12 summarizes the memory and I / O maps .
TABLE 9 . 12 Memory and I / O Maps for the Microcomputer of Figure 9 .
Port addresses for the odd 8255 Port A = F9H Port B = FBH Port C = FDH Control
Register = FFH Even Odd Table 9 . 12 summarizes the memory and I / O maps .
TABLE 9 . 12 Memory and I / O Maps for the Microcomputer of Figure 9 .
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NUMBER SYSTEMS AND CODES | 31 |
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SEQUENTIAL LOGIC DESIGN | 171 |
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addition address register addressing modes assembly asserted Assume base basic binary bits block branch byte cache called carry chip circuit clear clock combinational complement condition connected consider contains contents converter counter cycle decoder determine device diagram digits displacement effective enable example exception execution external field Figure flags flip-flop four function gate hardware HIGH immediate implemented indicates indirect Initialize input instruction interface interrupt K-map language lines loaded logic main memory means memory microcomputer microprocessor mode MOVE multiplication Note obtained offset operand operation output Pentium perform pins placed pointer port processing processor reset result segment sequence shift shown in Figure shows signal signed specified stack starting stored transfer typical unit vector Write zero