Renesas PCA7401 Informações Técnicas descarregar pdf (Página 57)

MITSUBISHI MICROCOMPUTERS

M37270MF-XXXSP

M37270EF-XXXSP, M37270EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

Fig. 62. Relation between field determination flag and display font

Both H

SYNC

signal and V

SYNC

signal are negative-polarity input

Field

Even

Odd

Field

determination

flag(Note)

Display dot line

selection bit

Display dot line

0 (T2 > T1)

1 (T3 < T2)

When using the field determination flag, be sure to set bit 0 of the PWM mode register 1 (address 020A

) to “0.”

Character ROM font configuration diagram

Dot line 0

Dot line 1

Odd

Dot line 0

Dot line 1

–

1) field

(Odd-numbered)

0.25 to 0.50[ms] at

f(X

) = 8 MHz

CC mode

•

EXOSD mode

135 79111315

2 4 6 8 10 12 14 16

1 3 5 7 9 1113152 4 6 8 10 12 14 16

OSD mode

SYNC

and

SYNC

control

signal

in microcom-

puter

Upper :

SYNC

signal

Lower :

SYNC

control

signal in

micro-

computer

(n) field

(Even-numbered)

1) field

(Odd-numbered)

When the display dot line selection bit is “0,”

the “ ” font is displayed at even field, the

“ ” font is displayed at odd field. Bit 7 of the

I/O polarity control register can be read as the

field determination flag : “1” is read at odd field,

“0” is read at even field.

Note : The field determination flag changes at a rising edge of the V

SYNC

control signal (negative-polarity input) in

the microcomputer.

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