Rev. 1.0, 02/00, page 863 of 1141
29.7.2
YCO and YBO Outputs
YCO output consists of character and border data in dot units. Either of two YCO output methods
can be selected by the YCO digital output specification bit: output of characters only, or
combined output of character and border data. The digital output blink control bit can be used to
select blinking for YCO output. The YCO data output specification bit must be reset to 0 when
bordering is not performed, and must be set to 1 when bordering is performed. YBO output is data
for the character display area. 32 characters’ worth of data is output starting from the start position
set by the horizontal-direction start position specification bit of the display position register. Here
blank-character intervals have no character display, and so there is no output. In addition, YBO
output cannot be made to blink.
The YCO and YBO outputs are multiplexed with port 8 inputs/outputs. For details on pin function
selection, refer to section 10.9, Port 8.
An example of YCO output and that of YBO output appear in figures 29.14 and 29.15,
respectively.
0
RAM
DOUT
BLNK DOBC YCOBC
0
1
0
1
0
1
YCO
YCO
YCO
YCO
YCO
(Blinking)
YCO
(Blinking)
(Low)
(Low)
0/1
0
1
1
Output Example
Character color:
Yellow (CR = 1, CG = 1, CB = 0)
Cursor color:
None (HT/CR = 0)
Background color: Green (BR = 0, BG = 1, BB = 0)
Border:
Black (EDGE = 1, EDGC = 0)
Button:
None
Button
Cursor
Border
Char
acter
Border
Cursor
Button
Bac
kg
round
Bac
kg
round
Figure 29.14 YCO Output Example