M37160M8 Datasheet, PDF (76/131 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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)).
Block 1 (on display)
“OSD interrupt request”
Block 1 (on display)
“OSD interrupt request”
Block 2 (on display)
“OSD interrupt request”
Block 2 (on display)
“OSD interrupt request”
Block 1’ (on display)
Block 2’ (on display)
“OSD interrupt request”
“OSD interrupt request”
Block 1’ (off display)
Block 2’ (off display)
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)
No
“OSD interrupt request”
No
“OSD interrupt request”
(A)
Block 1
Block 2
(B)
No
“OSD interrupt request”
“OSD interrupt request”
Window
Block 1
Block 2
“OSD interrupt request”
“OSD interrupt request”
Block 1’
(C)
“OSD interrupt request”
In OSD1 mode
Fig. 8.10.24 Note on Occurence of OSD Interrupt
Rev.1.01 2003.11.13 page 76 of 130