Compuprint 10200 Programmer Manual Instrukcja Użytkownika Pobierz pdf (Strona 211)

Interfaces

207

According to the IEEE - P1284 Standard, the pins assume different meanings and are identified by

different names depending on the actual handshaking mode as follows:

•

Compatibility mode (Centronics)

This is the lower level mode provides an asynchronous, byte-wide forward (host-to-peripheral)

channel with data and status lines used according to their original definitions. The interfaces power

up in the compatibility Mode Idle phase.

•

Nibble Mode

This mode provides an asynchronous, reverse (peripheral-to-host) channel, under control of

the host. In this mode, peripheral device to host data bytes are sent as two sequential, four-

bit nibbles using the four peripheral-to-host status lines. These two modes cannot be active

simultaneously.

•

Byte Mode

This mode provides an asynchronous, byte-wide reverse (peripheral-to host) channel based

on eight data lines of the interface for data and the control/status lines for handshaking.

Byte mode is under host control and it cannot be simultaneously active with compatibility

mode.

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