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DESCRIPTIONDESIG.DATE
-80050E
4.4 Character Display on LCD
2 line of 16 character data can be displayed on LCD by PMC LADDER program.
Not only fixed strings data but also a data containing a binary data can be displayed. (Numeric
variable display - Displaying after converting binary value to strings data)
Procedure of LCD display is shown as follows.
1. Selecting the line
( SELLN)
Upper line
Lower line
2. Writing new data
Data for upper line Data for lower line
3. Requesting to display
new data(REQDSP)
4. Acknowledgement
(ACKLCD)
(a) PMC confirms display acknowledgement (ACKLCD) is reset.
(b) PMC selects the line(SELLN) and writes new data for selected line.
(c) PMC sets display request (REQDSP) and waits for acknowledgement (ACKLCD).
(d) HMOP sets display acknowledgement (ACKLCD). Moreover, when the LCD display error
occurs, the cause is set in LCDER0-2.
(e) PMC resets display request (REQDSP) and can clear data for selected line.
(f) HMOP resets display acknowledgement (ACKLCD)
(b)
(f) (e)
(d)
(b)
(f) (e)
(d)
1
11
1
0
00
0
1
11
1
0
00
0
1
11
1
0
1
0
(PMC --> HMOP)
(PMC --> HMOP)
(PMC --> HMOP)
(HMOP --> PMC)
(a)
(c)
(a)
(c)
02 2001.8.20 Hanaoka This page is added.