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ST9 데이터시트(PDF) 53 Page - STMicroelectronics

부품명 ST9
상세설명  USER GUIDE
PDF  146 Pages
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ST9 데이터시트(HTML) 53 Page - STMicroelectronics

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ST9 USER GUIDE
being accidentally masked even in the case of a program failure. In any case, the Top Level
Interrupt uses the third fixed vector at addresses 4 and 5 in program memory. As the name im-
plies, it has a fixed priority that is higher than any other interrupt request. Though it does not
clear the IEN bit when acknowledged, unlike all other interrupt requests, its service routine
cannot be interrupted by any cause, including the Top Level Interrupt itself.
The simplified block diagram is the following:
Figure 21
. Top-Level Interrupt Simplified Block Diagram
NMI pin
Edge trigger event
selection: one bit of EIVR
Watchdog/NMI
source selection:
One bit of
CICR
Pending Bit
One bit of
NICR
Top Level Interrupt to
the core
Watchdog timer
End of Count
one bit of EIVR
Top Level not
maskable
Interrupt bit
Interrupt enable:
Two bits of
CICR
A detailed block diagram
is provided in Section 7



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