Measurement-computing PCM-D24/CTR3 rev.3 Uživatelský manuál stáhnout pdf (Strana 19)

MS = Mode Set. 1 = mode set active

M3 M2 Group A Function

0 0 Mode 0 Input / Output

0 1 Mode 1 Strobed Input / Output

1 X Mode 2 Bi-Directional Bus

A B CL CH Independent Function

1111Input

0000Output

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 may be independently programmed for input or

output.

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 below. D7 is

always 1 and D6, D5 & D2 are always 0.

ININININ1559B1111

OUTINININ1549A0111

INOUTININ153991011

OUTOUTININ152980011

ININOUTIN147931101

OUTINOUTIN146920101

INOUTOUTIN145911001

OUTOUTOUTIN144900001

INININOUT1398B1110

OUTININOUT1388A0110

INOUTINOUT137891010

OUTOUTINOUT136880010

ININOUTOUT131831100

OUTINOUTOUT130820100

INOUTOUTOUT129811000

OUTOUTOUTOUT128800000

CLBCUADECHEXD0D1D3D4

BASE +4, 5, 6, and 7

The 82C54 counter chip is quite complex. The data sheet for the part contains pro-

gramming information, input and output timing diagrams and interfacing specifica-

tions. We are sorry, but it is beyond the scope of this manual to reproduce the

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Measurement-computing PCM-D24/CTR3 rev.3 Uživatelský manuál Strana 19