20T202DA5JB Pacer Components, 20T202DA5JB Datasheet - Page 12

• Manufacturer Part Number: 20T202DA5JB
• Description: Vfd,vacuum Fluorescent Display
• Manufacturer: Pacer Components

2X20 VFD Module with 2-Wired Interface
6.2 Instruction Descriptions
6.2.1 Display Clear
6.2.2 Cursor Home
6.2.3 Entry Mode Set
This instruction
(1) Fills all locations in the display data RAM (DD-RAM) with 20H (Blank-character).
(2) Clears the contents of the address counter (ACC) to 00H.
(3) Sets the display for zero character shifts (returns original position).
(4) Sets the address counter (ACC) to point to the DD-RAM.
(5) If the cursor is displayed, moves the cursor to the left most character in the top line (upper line).
(6) Sets the address counter (ACC) to increment on the each access of DD-RAM or CG-RAM.
This instruction
(1) Clears the contents of the address counter (ACC) to 00H.
(2) Sets the address counter (ACC) to point to the DD-RAM.
(3) Sets the display for zero character shifts (returns original position).
(4) If the cursor is displayed, moves the left most character in the top line (upper line).
The I/D bit selects the way in which the contents of the address counter (ACC) are modified after every access to
DD-RAM or CG-RAM.
The S bit enables display shift, instead of cursor shift, after each write to the DD-RAM.
The direction in which the display is shifted is opposite in sense to that of the cursor.
For example, if S=0 and I/D=1, the cursor would shift one character to the right after a MPU writes to DD-RAM.
However if S=1 and I/D=1, the display would shift one character to the left and the cursor would maintain its position
on the panel. Similarly writing the CG-RAM always shift the cursor. Also both lines are shifted simultaneously.
* I/D = 0: The address counter (ACC) is decreased.
* S = 1: Display shift enabled.
* S = 0: Cursor shift enabled.
*Cursor Move and Display Shift by the "Entry Mode Set"
* I/D = 1: The address counter (ACC) is increased.
RS = 0
RS = 0
RS = 0
I/D
D7
D7
D7
0
1
0
1
0
0
0
D6
D6
D6
S
0
0
1
1
0
0
0
After writing the DD-RAM data
Cursor moves one character to the left
Cursor moves one character to the right
Display shifts one character to the right
without cursor
Display shifts one character to the left
without cursor
D5
D5
D5
0
0
0
D4
D4
D4
0
0
0
D3
D3
D3
0
0
0
D2
D2
D2
20T202DA5JB (Rev. 2.0)
0
0
1
Page - 12 of 16
I/D
D1
D1
D1
0
1
D0
D0
D0
S
1
*
After reading the DD-RAM data
Cursor moves one character to the left
Cursor moves one character to the right
Cursor moves one character to the left
Cursor moves one character to the right
Hex. Range
Hex. Range
02H or 03H
Hex. Range
04H ~ 07H
01H