7220 datasheet(113/303 Pages) RENESAS

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2-86

7220 Group User’s Manual

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 P52–P55 respectively. When clearing

the corresponding bits of the port P5 direction register (address 00CB16) to “0,” the pins are set for CRT

output pins, when setting to “1,” the pins are set for general-purpose port P5. Pin PUT2 is also used for

port P10. When clearing bit 7 of the CRT control register (address 00EA16) to “0,” the pin is set for port P10,

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 00EC16) can determine HSYNC

and VSYNC input polarity

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.

Fig. 2.11.17 CRT port control register (address 00EC16)

b7 b6 b5 b4 b3 b2 b1 b0

CRT port control register (CRTP) [Address 00EC16]

Name

Functions

After reset R W

CRT Port Control Register

0HSYNC input polarity

switch bit (HSYC)

0 : Positive polarity

1 : Negative polarity

0 : Positive polarity

1 : Negative polarity

R, G, B output polarity

switch bit (R/G/B)

0 : Positive polarity

1 : Negative polarity

OUT2 output polarity

switch bit (OUT2)

0 : Positive polarity

1 : Negative polarity

OUT1 output polarity

switch bit (OUT1)

0 : Positive polarity

1 : Negative polarity

R signal output switch bit

(OP5)

0 : R signal output

1 : MUTE signal output

G signal output switch bit

(OP6)

0 : G signal output

1 : MUTE signal output

B signal output switch bit

(OP7)

0 : B signal output

1 : MUTE signal output

VSYNC input polarity

switch bit (VSYC)

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