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ST7261 数据表(PDF) 18 Page - STMicroelectronics

部件名 ST7261
功能描述  LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, ROM MEMORY, LVD, WDG, TIMER
PDF  80 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST7261 数据表(HTML) 18 Page - STMicroelectronics

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INTERRUPTS (Cont’d)
6.3 INTERRUPTS AND LOW POWER MODES
All interrupts allow the processor to exit the WAIT
low power mode. On the contrary, only external
and other specified interrupts allow the processor
to exit from the HALT modes (see column “Exit
from HALT” in “Interrupt Mapping” table). When
several pending interrupts are present while exit-
ing HALT mode, the first one serviced can only be
an interrupt with exit from HALT mode capability
and it is selected through the same decision proc-
ess shown in Figure 17.
Note: If an interrupt, that is not able to Exit from
HALT mode, is pending with the highest priority
when exiting HALT mode, this interrupt is serviced
after the first one serviced.
6.4 CONCURRENT & NESTED MANAGEMENT
The following Figure 18 and Figure 19 show two
different interrupt management modes. The first is
called concurrent mode and does not allow an in-
terrupt to be interrupted, unlike the nested mode in
Figure 19. The interrupt hardware priority is given
in this order from the lowest to the highest: MAIN,
IT4, IT3, IT2, IT1, IT0, TLI. The software priority is
given for each interrupt.
Warning: A stack overflow may occur without no-
tifying the software of the failure.
Figure 18. Concurrent Interrupt Management
Figure 19. Nested Interrupt Management
MAIN
IT4
IT2
IT1
TLI
IT1
MAIN
IT0
I1
SOFTWARE
3
3
3
3
3
3/0
3
11
11
11
11
11
11 / 10
11
RIM
IT3
I0
10
PRIORITY
LEVEL
MAIN
IT2
TLI
MAIN
IT0
3
2
1
3
3
3/0
3
11
00
01
11
11
11
RIM
IT1
IT4
IT4
IT1
IT2
IT3
I1
I0
11 / 10
10
SOFTWARE
PRIORITY
LEVEL



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