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7220 bảng dữ liệu(PDF) 183 Page - Renesas Technology Corp

tên linh kiện 7220
Giải thích chi tiết về linh kiện  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  303 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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APPLICATION
5.1 Example of multi-line display
7220 Group User’s Manual
5-10
(2)
When setting multiple interrupts
Various priority processings are executed by enabling multiple interrupts and by setting priorities by
software. For example, to set the priority listed below;
ŒTimer 1 interrupt
VSYNC interrupt
ŽCRT interrupt
execute the following process:
Set only interrupt enable bits (ICON1, ICON2) whose priorities are higher than the current interrupt,
and enable the interrupt disable flag (I) in only the current interrupt processing routine.
Figure 5.1.9 shows the timing when all interrupt request bits (CRT, VSYNC, Timer 1) are “1” at the
same sampling point.
Note: When setting multiple interrupts, be sure to determine priority levels to prevent occurrence of
plural interrupts with the same priority level.
Fig. 5.1.9 Timing when all interrupt request bits are “1” at the same sampling point
CRT interrupt request bit
VSYNC interrupt request bit
Timer 1 interrupt request bit
CRT interrupt processing
VSYNC interrupt processing
Timer 1 interrupt processing
Interrupt disable flag (I)
1
0
1
0
1
0
A
B
1’
1
A’
(series of
)
3
B’
3
(series of
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3
(series of
)
2
2



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