PT6314_10 Datasheet, PDF (23/42 Pages) Princeton Technology Corp – Dot Character VFD Controller/Driver IC

PT6314
6. INSTRUCTIONS
Instruction
RS R/W DB7 DB6 DB5 DB4 DB3 DB2
Clear Display
0
0
0
0
0
0
0
0
Cursor Home
0
0
0
0
0
0
0
0
Entry Mode Set
0
0
0
0
0
0
0
1
Display ON/Off
0
0
0
0
0
0
1
D
Cursor or Display
Shift
0
0
0
0
0
1 SC R/L
Function Set
0
0
0
0
1 DL N
X
CGRAM Address
Set
0
0
0
1
ACG
DDRAM Address
Set
0
0
1
ADD
Read Busy Flag &
Address
0
1 BF-=”0”
ACC
Write Data to
CGRAM or DDRAM
1
0
Write Data
Read Data to
CGRAM or DDRAM
1
1
Read DR Data
Notes:
1. I/D=“1”: Increment
I/D=“0”: Decrement
2. S=”1”: Display Shift Enabled
S=“0”: Cursor Shift Enabled
3. D, C, B=“1”: Turn On
D, C, B=“0”: Turn OFF
4. S/C=“1”: Display Shift
S/C=”0”: Cursor Shift
5. R/L=“1”: Shift to the Right
R/L=“0”: Shift to the Left
6. DL=“1”: 8 Bits
DL=“0”: 4 Bits
7. N=“0”: 1-Line Display
N=“1”: 2-Line Display
8. BR1, BR0=“00”: 100%
BR1, BR0=”10”: 50%
BR1, BR0=”01”: 75%
BR1, BR0=“11”: 25%
9. X=Irrelevant
10. DDRAM: Display Data RAM
11. CGRAM: Character Generator RAM
12. ACG: CGRAM Address
13. ADD: DDRAM Address
14. ACC: Address Counter
DB1
0
1
1/D
C
X
BR1
DB0
1
X
S
B
X
BR0
Description
Clear all display, and sets DDRAM address
at 00H
Set DDRAM address at 00H. Also returns
the display being shifted to the original
position. DDRAM contents remain
unchanged.
Sets the cursor direction and specifies
display shift. These operations are
performed during the writing/reading of data.
Sets all display on/off (D)
Cursor on/off (C).
Cursor blinks on character position (B)
Shifts display or cursor, also keeps DDRAM
contents.
Sets data length (in parallel data transfer)
and number of line.
Sets address of CGRAM. After which
CGRAM data is transferred.
Sets DDRAM address, after which DDRAM
data is transferred.
Reads busy flag (BF) and address counter.
BF=”0”
Writes data into the CGRAM or DDRAM.
Reads data from CGRAM or DDRAM
6.1 “CLEAR DISPLAY” INSTRUCTION
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
CODE 0
0
0
0
0
0
0
0
0
1
During Reset,
DB7
0
DB6
0
DB5
0
DB4
0
DB3
0
DB2
0
DB1
0
DB0
1
The CLEAR DISPLAY Instruction performs the following operations:
1. Fills all Display Data RAM (DDRAM) location with 20H (Blank Character).
2. Clears the contents of the Address Counter (ACC) to 00H.
3. Sets the display for Zero Character Shift (Returns to original position.)
4. Sets the Address Counter to point to the Display Data RAM (DDRAM).
5. If the cursor is displayed, this instruction will move the cursor to the left most character in the upper display line.
6. Sets the Address Counter (ACC) to increment on each access of the DDRAM or CGRAM.
V1.5
23
October 2009