M37225M6_15 datasheet(78/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 76 of 124

REJ03B0136-0100Z

(8) 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 3 lines or more 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 block i V

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

and an interrupt occurs at the point at which the scanning line ex-

ceeds the block.

Fig. 8.10.26 Note on Occurence of OSD Interrupt

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 register i (addresses 00F916

and 00FA16), an OSD interrupt request does not occur (refer to Fig-

ure 8.10.26 (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 8.10.26 (B)).

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

end of the block (off display) out of window (refer to Figure 12.11.36

(C)).

(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”

No

“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)

Window

No

“OSD interrupt request”

No

“OSD interrupt request”

(A)

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