Measurement-computing CIO-DAS160x/1x Bedienungsanleitung PDF herunterladen (Seite 33)

M1 = 0 is mode 0 for group B. Input / Output

M1 = 1 is mode 1 for group B. Strobed Input / Output

The Ports A, B, C High and C Low can be independently programmed for input or output.

The two groups of ports, group A and group B, can be independently programmed in one of several

modes. The most commonly used mode is mode 0, input / output mode. The codes for programming the

8255 in this mode are shown in Table 6-5 below.

Table 6-5. Programming Codes for the 82C55 Chip

ININININ1559B1111

OUTINININ1549A0111

INOUTININ153991011

OUTOUTININ152980011

ININOUTIN147931101

OUTINOUTIN146920101

INOUTOUTIN145911001

OUTOUTOUTIN144900001

INININOUT1398B1110

OUTININOUT1388A0110

INOUTINOUT137891010

OUTOUTINOUT136880010

ININOUTOUT131831100

OUTINOUTOUT130820100

INOUTOUTOUT129811000

OUTOUTOUTOUT128800000

CLBCUADECHEXD0D1D3D4

NOTE:

D7 is always 1; D6, D5, and D2 are always 0.

6.1.12 CONVERT DISABLE REGISTER

BASE ADDRESS + 404h

TTTTTTTT

01234567

WRITE ONLY. Writing a 0 to this register enables triggering of the A/D converter if the DAS1600

mode is enabled. On power-up or reset this register is reset to conversion triggers enabled. Writing a

40 hex to this register disables A/D conversions.

6.1.13 BURST MODE ENABLE REGISTER

BASE ADDRESS + 405h

BBBBBBBB

01234567

WRITE ONLY. Burst mode enable. Writing 40 hex to this register enables the burst trigger. Writing 0

to this register disables burst trigger. On power-up or reset the burst trigger is disabled.

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 43 44

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Measurement-computing CIO-DAS160x/1x Bedienungsanleitung Seite 33