M37160MF datasheet(76/131 Pages) RENESAS

76 / 131 page

Rev.1.01

2003.11.13

page 76 of 130

M37160M8/MA/MF-XXXSP/FP,M37160EFSP/FP

8.10.10 Multiline Display

This microcomputer can ordinarily display 2 lines on the CRT screen

by displaying 2 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 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

8.10.24 (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 8.10.24 (B)).

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

end of the OSD1 mode block (display OFF) out of window (refer to

Figure 8.10.24(C)).

Fig. 8.10.24 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 OSD1 mode

Window

“OSD interrupt request”

(A)

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