参数资料
型号: ST72324K6B3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, SHRINK, PLASTIC, DIP-32
文件页数: 85/157页
文件大小: 1037K
代理商: ST72324K6B3/XXX
ST72324J/K
33/157
INTERRUPTS (Cont’d)
7.3 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 19.
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.
7.4 CONCURRENT & NESTED MANAGEMENT
The following Figure 20 and Figure 21 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 21. 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 20. Concurrent Interrupt Management
Figure 21. Nested Interrupt Management
MAIN
IT4
IT2
IT1
TLI
IT1
MAIN
IT0
I1
HARDWARE
PRIORITY
SOFTWARE
3
3/0
3
11
11 / 10
11
RIM
IT2
IT1
IT4
TLI
IT3
IT0
IT3
I0
10
PRIORITY
LEVEL
USED
STACK
=
1
0
BYTES
MAIN
IT2
TLI
MAIN
IT0
IT2
IT1
IT4
TLI
IT3
IT0
HARDWARE
PRIORITY
3
2
1
3
3/0
3
11
00
01
11
RIM
IT1
IT4
IT1
IT2
IT3
I1
I0
11 / 10
10
SOFTWARE
PRIORITY
LEVEL
USED
STACK
=
2
0
BYTES
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