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ST72324BJ2 bảng dữ liệu(PDF) 37 Page - STMicroelectronics

tên linh kiện ST72324BJ2
Giải thích chi tiết về linh kiện  8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
PDF  188 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST72324BJ2 bảng dữ liệu(HTML) 37 Page - STMicroelectronics

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ST72324B
Interrupts
37/188
Figure 18.
Interrupt processing flowchart
7.2.1
Servicing pending interrupts
As several interrupts can be pending at the same time, the interrupt to be taken into account
is determined by the following two-step process:
●
the highest software priority interrupt is serviced,
●
if several interrupts have the same software priority then the interrupt with the highest
hardware priority is serviced first.
Figure 19 describes this decision process.
Figure 19.
Priority decision process flowchart
Table 13.
Interrupt software priority levels
Interrupt software priority
Level
I1
I0
Level 0 (main)
Low
High
10
Level 1
0
1
Level 2
0
0
Level 3 (= interrupt disable)
1
1
“IRET”
RESTORE PC, X, A, CC
Stack PC, X, A, CC
load I1:0 from interrupt SW reg.
Fetch next
Reset
TRAP
Pending
I
nstruction
I1:0
from stack
load PC from interrupt vector
Y
N
Y
N
Y
N
Interrupt has the same or a
lower software priority
The interrupt
stays pending
than current one
Execute
instruction
I
nterrupt
PENDING
SOFTWARE
Different
INTERRUPTS
Same
HIGHEST HARDWARE
PRIORITY SERVICED
PRIORITY
HIGHEST SOFTWARE
PRIORITY SERVICED



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