20T202DA1J Pacer Components, 20T202DA1J Datasheet - Page 15
20T202DA1J
Manufacturer Part Number
20T202DA1J
Description
Vacuum Fluorescent Display Module
Manufacturer
Pacer Components
Datasheet
1.20T202DA1J.pdf
(17 pages)
2X20 LCD Compatible VFD Module
6.2.9 Write Data to CG or DD-RAM
6.2.7 Set CG-RAM Address
6.2.8 Set DD-RAM Address
This instruction:
(1) Load a new 6-bit address into the address counter (ACC).
(2) Sets the address counter (ACC) to address CG-RAM.
Once "Set CG-RAM Address" has been executed, the contents of the address counter (ACC) will be automatically
modified after every access of CG-RAM, as determined by the "Entry Mode Set" instruction".
The active width of the address counter (ACC), when it is addressing CG-RAM, is 6 bits, so the counter will wrap
around to 3FH from 00H if more than 64 bytes of data are written into CG-RAM.
This instruction:
(1) Loads a new 7-bit address into the address counter (ACC).
(2) Sets the address counter (ACC) to point to the DD-RAM.
Once the "Set DD-RAM Address" instruction has been executed, the contents of the address counter (ACC) will be
automatically modified after each access of DD-RAM, as selected by the "Entry Mode Set" instruction
This instruction writes 8-bit binary data (D7 to D0) into CG-RAM or DD-RAM. To write into CG-RAM or DD-RAM
is determined by the previous specification of the CG-RAM or DD-RAM address setting. After a write, the address is
automatically increased or decreased by 1 according to the entry mode. The entry mode also determines the display
shift. When data is written to the CG-RAM (UDF character data), the D7, D6 and D5 bits are not displayed as
characters.
*Valid DD-RAM Address Ranges
RS = 0
RS = 0
RS = 1
D7
D7
D7
0
1
2nd line
1st line
D6
D6
D6
1
Number of Character
D5
D5
D5
Character Code (Write-in)
40
40
D4
D4
D4
ADD
D3
D3
D3
ACG
20T202DA1J (Rev. 3.0)
D2
D2
D2
Address Range
Page - 15 of 17
00H to 27H
40H to 67H
D1
D1
D1
D0
D0
D0
C0H ~ E7H for 2nd Line
80H ~ A7H for 1st Line
00H ~ 0FH for CG-RAM Code
10H ~ FFH for CG-ROM Code
Hex. Range
40H ~ 7FH
Hex. Range
Hex. Range
.