7220 datasheet(176/303 Pages) RENESAS

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APPLICATION

5.1 Example of multi-line display

5-3

7220 Group User’s Manual

5.1.3 General flowchart

The multi-line display processing routine consists of initialization processing routine, VSYNC interrupt processing

routine, and CRT interrupt processing routine.

(1)

Initialization processing routine

This routine is used to initialize to cause a CRT interrupt.

Fig. 5.1.3 Flowchart of initialization processing routine

CS (address 00E4 16)

MD (address 00E5 16)

HR (address 00E0 16)

CK (address 00ED 16)

Multi-line display start

END

CV2 (address 00E2 16)

←

Vertical display start position of the 12th line (block 2)

Line counter

F_VSYNC

Block 1 display RAM

←

Display character (blank) of block 1 (addresses 0600 16 to 061716)

Character color (no output) of block 1 (addresses 0680 16 to 069716)

Enable CRT interrupt in synchronized

with the next V SYNC

Character size : minimum size

Border output

Set a horizontal display start position

Set display clock

Disable only CRT interrupt

All blocks display off

Select R/G/B/OUT1

HSYNC/VSYNC input polarity : positive polarity input

R/G/B/OUT1 output polarity : positive polarity output

Color register 0 : red

Color register 1 : blue

Color register 2 : white

Color register 3 : cyan

←“000000002”

←“000001012”

←“XXXXXXXX2”

←“000000102”

Counter RAM for line counting

Vertical position registers 1, 2

Port P5 direction register

CRT port control register

CRT control register

Color registers 0 to 3

VSYNC flag

Border selection register

CRT clock selection register

Line counter :

CV1, CV2 :

P5D :

CRTP :

CC :

CO0 to CO3 :

F_VSYNC :

MD :

CK :

Initialization

←“0”

←“000000002”

←“000010002” (red)

←“000000102” (blue)

←“000011102” (white)

←“000001102” (cyan)

CRTE (bit4 at address 00FE 16)

CC (address 00EA 16)

P5D (address 00CB 16)

CRTP (address 00EC 16)

CO0 (address 00E6 16)

CO1 (address 00E7 16)

CO2 (address 00E8 16)

CO3 (address 00E9 16)

Block 2 display RAM

←

Display character (blank) of block 2 (addresses 0620 16 to 063716)

Character color (no output) of block 2 (addresses 06A0 16 to 06B716)

CV1 (address 00E1 16)

←

Vertical display start position of the 11th line (block 1)

←“0”

←“1”

Bit 4 of interrupt control register 1

Bit 4 of interrupt request register 1

Character size register

Horizontal position register

CRTE :

CRTR :

CS :

HR :

Note: This routine is not interrupt

processing routine.

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