7220 Datasheet, PDF (107/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

FUNCTIONAL DESCRIPTION
2.11 CRT display function
(2) CRT display RAM (addresses 060016 to 06B716)
CRT display RAM is assigned to addresses 060016 to 06B716, and is divided into a display character
code specification part and display color specification part for each block. Table 2.11.4 shows the
contents of CRT display RAM.
For example, to display a character at the first character position (leftmost) in block 1, it is necessary
to write the character code in address 060016 and the color register No. to the low-order 2 bits (bits
0 and 1) at address 068016. The color register No. to be written here is one of the 4 color registers
in which display color is set in advance. For details on color registers, refer to “2.11.4 Color registers.”
Table 2.11.4 Contents of CRT display RAM
Block number
Block 1
Not used
Block 2
Display position (from left side)
1st character
2nd character
3rd character
:
22nd character
23rd character
24th character
1st character
2nd character
3rd character
:
22nd character
23rd character
24th character
Character code specifying
060016
060116
060216
:
061516
061616
061716
061816
to
061F16
062016
062116
062216
:
063516
063616
063716
Color specifying
068016
068116
068216
:
069516
069616
069716
069816
:
069F16
06A016
06A116
06A216
:
06B516
06B616
06B716
2-80
7220 Group User’s Manual