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FUNCTIONAL DESCRIPTION
2.11 CRT display function
2.11.7 CRT output pin control
CRT display output pins R, G, B, and OUT1 are also used for ports P5
the corresponding bits of the port P5 direction register (address 00CB
output pins, when setting to "1," the pins are set for general-purpose port P5. Pin PUT2 is also used for
port P1
. When clearing bit 7 of the CRT control register (address 00EA
0
when setting to "1," the pin is set for pin OUT2.
Immediately after reset release, because the port P5 direction register is reset, they become CRT output
pins R, G, B, and OUT.
Bits 0 to 4 of the CRT port control register (address 00EC
and R, G, B, OUT1, and OUT2 output polarity. When clearing corresponding bits to "0," positive polarity
is selected, when setting to "1," negative polarity is selected.
Figure 2.11.17 shows the CRT port control.
CRT Port Control Register
b7 b6 b5 b4 b3 b2 b1 b0
Fig. 2.11.17 CRT port control register (address 00EC
2-86
) can determine H
16
CRT port control register (CRTP) [Address 00EC
B
Name
0
H
input polarity
SYNC
switch bit (HSYC)
1
V
input polarity
SYNC
switch bit (VSYC)
2
R, G, B output polarity
switch bit (R/G/B)
3
OUT2 output polarity
switch bit (OUT2)
4
OUT1 output polarity
switch bit (OUT1)
5
R signal output switch bit
(OP5)
6
G signal output switch bit
(OP6)
7
B signal output switch bit
(OP7)
)
16
7220 Group User's Manual
–P5
respectively. When clearing
2
5
) to "0," the pins are set for CRT
16
) to "0," the pin is set for port P1
16
and V
SYNC
]
16
Functions
After reset R W
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : R signal output
1 : MUTE signal output
0 : G signal output
1 : MUTE signal output
0 : B signal output
1 : MUTE signal output
,
0
input polarity
SYNC
0
R W
0
R W
0
R W
0
R W
0
R W
0
R W
0
R W
0
R W
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