7220 Datasheet, PDF (160/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

M37220M3-XXXSP/FP
4.5 Functional description
The character code used to specify a display character is determined based on the address in the
CRT display ROM in which that character data is stored.
Assume that 1 character data is stored in addresses 10XX016 to 10XXF16 (XX denotes 0016 to 7F16)
and 10YY016 to 10YYF16 (YY denotes “XX+80016”), then the character code is “XX16.”
In other words, a character code is constructed with the low-order second and third digits (hexadecimal
notation) of the 5-digit address (1000016 to 107FF16) where that character data is stored.
A character code is “YY16” in addresses 1100016 to 11FFF16.
Table 4.5.6 shows the character code table.
Table 4.5.6 Character code table (be omitted partly)
Character code
0016
0116
0216
0316
:
7E16
7F16
Character data stored address
Left side 8 dots
Right 4 side 8 dots
1000016 to 1000F16
1080016 to 1080F16
1001016 to 1001F16
1081016 to 1081F16
1002016 to 1002F16
1082016 to 1082F16
1003016 to 1003F16
1083016 to 1083F16
:
:
107E016 to 107EF16
10FE016 to 10FEF16
107F016 to 107EF16
10FF016 to 10FFF16
s CRT display RAM (addresses 060016 to 06B316)
CRT display RAM is assigned to addresses 060016 to 06B316. Table 4.5.7 shows the contents of
CRT display RAM.
Table 4.5.7 Contents of CRT display RAM
Block number
Block 1
Not used
Block 2
Display position (from left side)
1st character
2nd character
3rd character
:
18th character
19th character
20th character
1st character
2nd character
3rd character
:
18th character
19th character
20th character
Character code specifying
060016
060116
060216
:
061116
061216
061316
061416
to
061F16
062016
062116
062216
:
063116
063216
063316
Color specifying
068016
068116
068216
:
069116
069216
069316
069416
:
069F16
06A016
06A116
06A216
:
06116
06216
06316
4-22
7220 Group User’s Manual