M306V2EEFS datasheet(220/271 Pages) RENESAS

220 / 271 page

Rev.1.40

Oct 06, 2004 page 220 of 269

M306V2ME-XXXFP, M306V2EEFP

2.16.13 Multiline Display

This microcomputer 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 OSD1 interrupts.

An OSD1 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 scanning line exceeds the block. The mode in which an OSD1 interrupt occurs is

different depending on the setting of the OSD control register 2 (refer to Figure 2.16.7).

• When bit 7 of the OSD control register 2 is “0”

An OSD1 interrupt request occurs at the completion of layer 1 block display.

• When bit 7 of the OSD control register 2 is “1”

An OSD1 interrupt request occurs at the completion of layer 2 block display.

Notes 1: An OSD1 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 register i

(addresses 021016 to 021F16), an OSD1 interrupt request does not occur (refer to Figure

2.16.41 (A)).

2: When another block display appears while one block is displayed, an OSD1 interrupt request

occurs only once at the end of the another block display (refer to Figure 2.16.40 (B)).

3: On the screen setting window, an OSD1 interrupt occurs even at the end of the CC mode block

(off display) out of window (refer to Figure 2.16.40 (C)).

Figure 2.16.40 Note on occurrence of OSD1 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)

“OSD1 interrupt request”

Block 1

Block 2

“OSD1 interrupt request”

Block 1

Block 2

Block 3

On display (OSD1 interrupt request occurs

at the end of block display)

Off display (OSD1 interrupt request does

not occur at the end of block display)

Window

“OSD1 interrupt request”

(A)

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