Intel mcs-48 manual Nrfo, Til, Ieee Gpib

8293

Symbol	1/0	Pin No.				Function
NRFO"	1/0	17	Not Ready For Data; IEEE
			GPIB bus handshake control
			line. When an input, it is a TTL
			compatible				Schmitt·trigger.
			When an output, it is an open·
			collector driver with a 48 mA
			current sinking capability.
T/R2		2	Transmit			receive		2;	direction
			control for EOL If T/R2 is high,
			EOI" is sending. Input Is TIL
			compatible.
	1/0	3	End		or	Identify;		processor
			GPIB bus control line; is used
			by a talker by indicate the end
			of a multiple byte transfer.
			This pin is TIL compatible.
EOI"	1/0	15	End or Identify; IEEE GPIB bus
			control line; is used by a talker
			to indicate the end of a multi-
			ple byte transfer. This pin is a
			three-state (push-pull) driver
			capable of sinking 48 mA and
			a	TIL		compatible			receiver
			with hysteresiS.
		8	Service			Request;		processor
			GPIB bus control line; used by
			a device to indicate the need
			for service and to request an
			interruption of the current se-
			quence of events on the GPIB.
			It is a TIL compatible input
SRO"	o	16	Service Request;					IEEE GPIB
			bus control line; it is an oPen
			collector			driver		capable		of
			sinking 48 mAo
	o	6	Remote			Enable;		processor
			GPIB bus control line; used by
			a	controller			(in	conjunction
			with		other		messages)			to
			select between two alternate
			sources of device program-
			ming data (remote ·or local

control). This output is TIL compatible.

REN" 13 Remote Enable; IEEE GPIB bus control line. This input is

aTIL compatible Schmitt- trigger.

o 4 Attention; processor GPIB bus control line; used by the 8291 to determine how data on the 010 signal lines are to be interpreted. This Is a TIL compatible output.

ATN"	19	Attention; IEEE GPIB bus con-
		trol line; this input is a TIL
		compatible Schmitt·trlgger.

Symbol 1/0	Pin No.		Function
o	5	Interface	Clear;	processor
		GPIB bus control line; used by
		a controller to place the inter-
		face system into a known
		quiescent state. It is a TIL
		compatible output.
IFC"	12	Interface	Clear;	IEEE GPIB
		bus control line. This input is

aTIL compatible Schmitt- trigger.

T/Ffl01		11	Transmit receive General 10;
T/RI02		23	direction control for the two
			spare transceivers. Input is
			TIL compatible.
	1/0	24	General 10; this is the TIL
	1/0	25	side of the two spare tran-
			sceivers. These pins are TTL
			compatible.
G101"	1/0	21	General 10; these are spare
G102"	1/0	22	three-state (push-pull) driversl
			Schmitt-trigger receivers. The
			drivers can sink 48 mAo
			MODEl
			OPTA
			OPT"
DAV	1 -------		1
T/ih
010,	/ ------		H
010,	/ ------		H
010,	/ ------		H
I!i!l4	I ------		H
rno,	/ ------		H
iiiOs	I ------		H
Dill,	I ------		H
~ 1 ------			+ - 1
Afiij
EOi

Figura 4. TalkerlListener Data Configuration

9-111