M37274EFSP datasheet(94/148 Pages) RENESAS

94 / 148 page

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

and ON-SCREEN DISPLAY CONTROLLER

M37274EFSP

PRELIMINARY

Notice:

This

is not

a final

specification.

Some

paramentic

limits

are

subject

to change.

MITSUBISHI MICROCOMPUTERS

(11) Multiline Display

The M37274EFSP can ordinarily display 16 lines on the CRT screen

by displaying 16 blocks at different vertical positions. In addition, it

can display up to 16 lines by using OSD interrupts.

An OSD interrupt request occurs at the point at which display of each

block has been completed. In other words, when a scanning line

reaches the point of the display position (specified by the vertical

position registers) of a certain block, the character display of that

block starts, and an interrupt occurs at the point at which the scan-

ning line exceeds the block. The mode in which an OSD interrupt

occurs is different depending on the setting of the raster color regis-

ter (refer to Figure 99).

· When bit 7 of the raster color register is “0”

An OSD interrupt occurs at the end of block display in the OSD

and the EXOSD mode.

· When bit 7 of the raster color register is “1”

An OSD interrupt occurs at the end of block display in the CC mode.

Notes 1: An OSD interrupt does not occur at the end of display when

the block is not displayed. In other words, if a block is set to

off display by the display control bit of the block control reg-

ister (addresses 00D016 to 00DB16), an OSD interrupt re-

quest does not occur (refer to Figure 93 (A)).

2: When another block display appeares while one block is

displayed, an OSD interrupt request occurs only once at

the end of the another block display (refer to Figure 93 (B)).

3: On the screen setting window, an OSD interrupt occurs

even at the end of the CC mode block (off display) out of

window (refer to Figure 93 (C)).

Fig. 93. Note on Occurence of OSD Interrupt

(B)

(C)

Block 1 (on display)

Block 2 (on display)

Block 3 (on display)

Block 4 (on display)

Block 1 (on display)

Block 2 (on display)

Block 3 (off display)

Block 4 (off display)

“OSD interrupt request”

Block 1

Block 2

“OSD interrupt request”

Block 1

Block 2

Block 3

On display (OSD interrupt request occurs

at the end of block display)

Off display (OSD interrupt request does

not occur at the end of block display)

In CC mode

Window

“OSD interrupt request”

(A)

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