7220 Datasheet, PDF (99/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

FUNCTIONAL DESCRIPTION
2.11 CRT display function
(Address 00EA16)
CRT control register
(Addresses 00E116, 00E216)
Vertical position registers
(Address 00E416)
Character size register
(Address 00E016)
Horizontal position register
(Address 00E516)
Border selection register
OSC1
OSC2 HSYNC VSYNC
Display oscillation
circuit
Display position control circuit
RAM for display
10 bits ! 24 characters !
2 lines
(Addresses 00E616
to 00E916)
Color registers
(Address 00EC16)
CRT port control register
Data bus
Fig. 2.11.2 CRT display circuit block diagram
Display control
circuit
ROM for display
12 bits ! 16 dots !
256 characters
Shift register
12 bits
Shift register
12 bits
Output circuit
R
G
B OUT1 OUT2
2-72
7220 Group User’s Manual