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7.0 FUNCTIONAL DESCRIPTION
7.1 ADDRESS COUNTER (AC)
7.1.1 SINGLE LINE DISPLAYS
The AC stores the address of the data being written to and read from DDRAM or CGRAM. The
AC increments by 1 (overflows from 4FH to 00H) or decrements by 1 (underflows from 00H to
4FH) after each DDRAM access. The AC increments by 1 (overflows from 3FH to 00H) or
decrements by 1 (underflows from 00H to 3FH) after each CGRAM access. When addressing
DDRAM, the value in the AC also represents the cursor position.
7.1.2 MULTIPLE LINE DISPLAYS
The AC stores the address of the data being written to and read from DDRAM or CGRAM. The
AC increments by 1 (overflows from 27H to 40H and from 67H to 00H) or decrements by 1
(underflows from 40H to 27H and from 00H to 67H) after each DDRAM access. The AC
increments by 1 (overflows from 3FH to 00H) or decrements by 1 (underflows from 00H to 3FH)
after each CGRAM access. When addressing DDRAM, the value in the AC also represents the
cursor position.
7.2 DISPLAY DATA RAM (DDRAM)
7.2.1 SINGLE LINE DISPLAYS
The DDRAM stores the character code of each character being displayed on the VFD. Valid
DDRAM addresses are 00H to 4FH. DDRAM not being used for display characters can be used
as general purpose RAM. The tables below show the relationship between the DDRAM address
and the character position on the VFD before and after a display shift (with the number of display
lines set to 1).
7.2.2 MULTIPLE LINE DISPLAYS
The DDRAM stores the character code of each character being displayed on the VFD. Valid
DDRAM addresses are 00H to 27H and 40H to 67H. DDRAM not being used for display
characters can be used as general purpose RAM. The tables below show the relationship
between the DDRAM address and the character position on the VFD before and after a display
shift (with the number of display lines set to 2).
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M0420SD-204SDAR1-3
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