M37271MF-252SP datasheet(57/97 Pages) MITSUBISHI

57 / 97 page

MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

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

and ON-SCREEN DISPLAY CONTROLLER

Fig. 65. Relation between field determination flag and display font

Both HSYNC signal and VSYNC 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 16) to “0.”

Character ROM font configuration diagram

Dot line 0

Dot line 1

Odd

Dot line 0

Dot line 1

(n–1) field

(Odd-numbered)

0.25 to 0.50[ms] at

f(XIN) = 8 MHz

CC mode · EXOSD mode

OSD mode

HSYNC

VSYNC and

VSYNC

control

signal

in microcom-

puter

Upper :

VSYNC signal

Lower :

VSYNC control

signal in

micro-

computer

(n) field

(Even-numbered)

(n+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.

M37271MF-252SP Datasheet(PDF) 57 Page - Mitsubishi Electric Semiconductor

M37271MF-252SP Datasheet(HTML) 57 Page - Mitsubishi Electric Semiconductor

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