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ST9 Folha de dados(PDF) 52 Page - STMicroelectronics

Nome de Peças ST9
Descrição Electrónicos  USER GUIDE
PDF  146 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST9 Folha de dados(HTML) 52 Page - STMicroelectronics

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ST9 USER GUIDE
The simplified block diagram is the following:
Figure 20
. External Interrupts Simplified Block Diagram
3.4.3.2 Top-Level Interrupt
The Top Level Interrupt can have two sources: either the NMI pin, or the watchdog end-of-
count(5). This interrupt level has a special feature that allows you to mask it like any other in-
terrupt, or to make it a real non-maskable interrupt. For this, the TLNM bit (see Figure 21) can
remove the effect of the mask. Once set, it cannot be reset, thus preventing this interrupt from
(5) See Section 4.3 on the Watchdog Timer.
3
3
External Interrupt pin
(INT0 to INT7)
Edge trigger event
selection: one bit of EITR
Internal/External
source selection
One bit of
EIPR
Pending Bit
One bit of
EIMR
External interrupt
priority level
Current priority
level (CPL)
Interrupt to
the core
Bit IEN of CICR
Interrupt enable
Only for:
A0: INT0 or WDT interrupt
B0 INT2 or SPI interrupt
Internal interrupt
Priority
Comparator
(Device dependent)
A detailed block diagram
is provided in Section 7
Mask Bit



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