Measurement-computing CIO-DAS16 Manual do Utilizador descarregar pdf (Página 31)

The two groups of ports, group A and group B, may be independently programmed in one of several modes. The most

commonly used mode is mode 0, input / output mode. The codes for programming the 82C55 in this mode are shown in

Table 4-4. D7 is always 1 and D6, D5 & D2 are always 0.

Table 4- 4. Programming Codes for 82C55 in Mode 0, Input/Output Mode

ININININ1559B1111

OUTINININ1549A0111

INOUTININ153991011

OUTOUTININ152980011

ININOUTIN147931101

OUTINOUTIN146920101

INOUTOUTIN145911001

OUTOUTOUT IN144900001

INININOUT1398B1110

OUTININOUT1388A0110

INOUTINOUT137891010

OUTOUTINOUT136880010

ININOUTOUT131831100

OUTINOUTOUT130820100

INOUTOUTOUT129811000

OUTOUTOUTOUT128800000

CLBCHADECHEXD0D1D3D4

1 2 ... 26 27 28 29 30 31 32 33 34 35 36

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Measurement-computing CIO-DAS16 Manual do Utilizador Página 31