M37151 datasheet(85/139 Pages) RENESAS

85 / 139 page

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

and ON-SCREEN DISPLAY CONTROLLER

M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP

MITSUBISHI MICROCOMPUTERS

Rev. 1.0

8.11.10 Multiline Display

This microcomputer can display 2 lines on the CRT screen by dis-

playing 2 blocks at different vertical positions. In addition, it can dis-

play up to 16 lines by using OSD interrupts.

An OSD interrupt request occurs at the point at which that 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.

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 display off by the

display control bit of the block control register (addresses 00D216,

00D316), an OSD interrupt request does not occur (refer to Figure

8.11.24 (A)).

2: When another block display appears while one block is displayed, an

OSD interrupt request occurs only once at the end of the second

block display (refer to Figure 8.11.24 (B)).

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

end of the CC mode block (display off) out of window (refer to Figure

8.11.24 (C)).

Fig. 8.11.24 Note on Occurence of OSD Interrupt

(B)

(C)

Block 1 (on display)

Block 2 (on display)

Block 1’ (on display)

Block 2’ (on display)

Block 1 (on display)

Block 2 (on display)

Block 1’ (off display)

Block 2’ (off display)

“OSD interrupt request”

Block 1

Block 2

“OSD interrupt request”

Block 1

Block 2

Block 1’

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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