Character Registers - Motorola MC68HC05T16 Technical Data Manual

Code $00
9.3.3

Character Registers

Character Code reg. 1
Character Attribute reg. 1
Character Code reg. 128
Character Attribute reg. 128
There are a total of 128 character code registers, 32 characters per row for four rows.
Character Codes:
ROM/RAM - ROM/RAM mapping select
1 (set) – CH6-CH0 is mapped to the 16 RAM codes.
0 (clear) – CH6-CH0 is mapped to the 128 ROM/EPROM codes.
CH6-CH0
0 to 127 = ROM/EPROM codes.
0 to 15 = RAM codes. Codes 16 and higher are invalid.
MC68HC05T16
Code $20 : Blank
Figure 9-2 Reserved Character ROM Codes
Address bit 7 bit 6
$200 CH6
ROM/RAM
$201 BLNKG BGEN
$2FE CH6
ROM/RAM
$2FF BLNKG BGEN
ON-SCREEN DISPLAY
bit 5 bit 4 bit 3 bit 2
CH5 CH4 CH3 CH2
CCOL2 CCOL1 CCOL0 uuuu uuuu
BGCOL2 BGCOL1 BGCOL0
:
:
CH5 CH4 CH3 CH2
CCOL2 CCOL1 CCOL0 uuuu uuuu
BGCOL2 BGCOL1 BGCOL0
Code $7F : Full-Filled
State
bit 1 bit 0
on reset
CH1 CH0 uuuu uuuu
CH1 CH0 uuuu uuuu
TPG
MOTOROLA
9-5
9