st72324bk STMicroelectronics, st72324bk Datasheet - Page 33

• Manufacturer Part Number: st72324bk
• Description: 3 V/5 V Range 8-bit Mcu With 4/8 Kbyte Rom, 10-bit Adc, Four Timers And Spi
• Manufacturer: STMicroelectronics

ST72323 ST72323L
6.3
Note:
6.4
Caution:
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 exiting 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 process shown in
Figure
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.
Concurrent and nested management
The following
first is called concurrent mode and does not allow an interrupt to be interrupted, unlike the
nested mode in
lowest to the highest: MAIN, IT4, IT3, IT2, IT1, IT0. The software priority is given for each
interrupt.
A stack overflow may occur without notifying the software of the failure.
Figure 15. Concurrent interrupt management
Figure 16. Nested interrupt management
14.
Figure 15
11 / 10
11 / 10
MAIN
MAIN
RIM
RIM
Figure
IT2
16. The interrupt hardware priority is given in this order from the
and
IT2
IT1
Figure 16
IT1
IT4
TRAP
TRAP
show two different interrupt management modes. The
IT1
IT4
IT0
IT0
IT3
IT3
IT1
IT4
IT2
10
10
SOFTWARE
PRIORITY
LEVEL
SOFTWARE
PRIORITY
LEVEL
MAIN
MAIN
3
3
3
3
3
3
3/0
3
3
2
1
3
3
3/0
I1
I1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
0 0
0 1
1 1
1 1
Interrupts
I0
I0
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