CodePudding user response:

Only look at the picture, the D/C data or command C, D R/W R read or write W, is generally behind the slash is low, the specific look at the manual

CodePudding user response:

Before and after the left side

CodePudding user response:

This is parallel port 6800 agreement, the following is to write the data sequence, CS# down all the time:

D/C=1;//data, D/C=0 means instruction
R/W=0;//write data, R/W=1 indicates the data read
E=0;//disability
D=XX;//prepare data
E=1;//enabled, and began to write data
//delay slightly delay
E=0;

This is the reading sequence:
D/C=0;
R/W=1;
E=1;
Delay;
XX=D;
E=0;

You can see that the D/C and R/W is a control signal, E is equivalent to the clock signal, signal CS# is enabled

CodePudding user response:

reference poetryTang reply: 3/f

6800 parallel port is this agreement, the following is write data sequence, CS# down all the time:

D/C=1;//data, D/C=0 means instruction
R/W=0;//write data, R/W=1 indicates the data read
E=0;//disability
D=XX;//prepare data
E=1;//enabled, and began to write data
//delay slightly delay
E=0;

This is the reading sequence:
D/C=0;
R/W=1;
E=1;
Delay;
XX=D;
E=0;

You can see that the D/C and R/W is a control signal, E is equivalent to the clock signal, CS# is enabled signal

Look at my chart under the words?

CodePudding user response:

reference 1st floor forget345 response:

just look at the picture, data or command D C, D/C R/W R read or write W, is generally behind the slash is low, the specific look at manual

I am writing on the bottom of the picture?

CodePudding user response:

Program is to give you, also don't understand?
Up to data, it is the D/C, to command the D/C down
Read up the R/W, written to pull the R/W low
If it is written, E lower prepare data, raising began to write data, write down again
If they are read, E up wait for a moment you can read, read down

CodePudding user response:

refer to 6th floor poetryTang response:

program for you, also don't understand you
Up to data, it is the D/C, to command the D/C down
Read up the R/W, written to pull the R/W low
If it is written, E lower prepare data, raising began to write data, write down again
If they are read, E up wait for a moment you can read, read down

I mean single on the figure of it
This information can see that you say?
I think it is no good
The dc rw double image information can't give you said?
Understand?

CodePudding user response:

Figure is the read/write two sequential drawing together, understand?

CodePudding user response:

reference 5 floor clasier reply:

Quote: refer to 1st floor forget345 response:

just look at the picture, data or command D C, D/C R/W R read or write W, is generally behind the slash is low, the specific look at manual

I am writing on the bottom of the picture?

Have made it very clear the well
D/C for high data transmission and transmission command for low
D/CRead data R/W is high, write data for R/W low
So see you understand?

CodePudding user response:

refer to the eighth floor poetryTang response:

figure just read and write the two sequential drawing together, understand?

See,,,,,,,,,

CodePudding user response:

Sequence diagram is mainly is to tell you the time requirements, such as TAS is to tell you, before raising E TAS time, you need to put the D/C, R/W in the level you want

CodePudding user response:

Question has good depth