DOCUMENT NO. REV.NO PAGE
STANDARD
NAME
00 8/20
Table-8 Register Selection
M68 i80
RS
R/W /RD /WR
Operation
0 0 1 0 IR write as an internal operation (display clear, ect.)
0 1 0 1 Read busy flag (DB7) and address counter (DB0 to DB6)
1 0 1 0 DR write as an internal operation (DR to DD-RAM or CG-RAM)
1 1 0 1 DR read as an internal operation (DD-RAM or CG-RAM to DR)
5.1.1 Busy Flag (BF)
When the busy flag is 1, the controller is
in the internal operation mode, and the next instruction will
not be accepted. When RS =0 and R/W=1 (Table-8), the busy flag is output to DB7.
The next instruction must be written after ensuring that the busy flag is 0.
5.1.2 Address Counter (ACC)
The address counter (ACC) assigns addresses to both DD-RAM and CG-RAM. When an address of an
instruction is written into the IR, the address information is sent from the IR to the ACC. Selection of
either DD-RAM or CG-RAM is also determined concurrently by the instruction. After writing into
(reading from) DD-RAM or CG-RAM, the ACC is automatically incremented by 1 (decremented by
1). The ACC contents are then output to Db0 to Db6 when RS =0 and R/W=1 (See Table-8).
5.1.3 Display Data RAM (DD-RAM)
Display data RAM (DD-RAM) stores display data represented in 8-bit character codes.
The area in DD-RAM that is not used for display can be used as general data RAM.
See Table-9 for the relationships between DD-RAM addresses and positions on the VFD
Table-9 Relation between Digit Position and DD-RAM data
Left End 2nd
Column 3
rd
column - - - - - - - - - - - 39
th
Column Right End
1st
Row 00H 01H 02H - - - - - - - - -- - - 26H 27H
2nd 40H 41H 42H - - - - - - - - -- - - 66H 67H
5.1.4 Character Generator ROM (CG-ROM)
The character generator ROM (CG-ROM) generates character patterns of 5x8 dots from 8-bit character
codes (table-10). It can generate 240 kinds of 5x8 dots character patterns.
The character fonts are shown on the following page. The character codes 00H to 0FH are allocated to
the CG-RAM.
5.1.5 Character Generator RAM (CG-RAM)
In the character generator RAM (CG-RAM), the user can
rewrite character patterns by program.
For 5
々8 dots and cursor, eight character patterns can be
written. Write into DD-RAM the character codes at the
addresses shown as the left column of Table-10 to show
the character patterns stored in CG-RAM.
See Table-11 for the relationship between CG-RAM
addresses and data and display patterns and refer to
Fig-10 for dot assignment of VFD.
Areas that are not used for display can be used as general data RAM
12345
678910
11 12 13 14 15
16 17 18 19 20
21 22 23 24 25
26 27 28 29 30
31 32 33 34 35
36 37 38 39 40
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