ST72561J9-Auto STMicroelectronics, ST72561J9-Auto Datasheet - Page 51

• Manufacturer Part Number: ST72561J9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72561J9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years at 55 °C
• 5 Power Saving Modes: halt, auto wake up from halt, active halt, wait and slow

ST72561-Auto
Table 12.
Figure 17. Interrupt processing flowchart
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:
●
●
Figure 18
Figure 18. Priority decision process
Level 0 (main)
Level 1
Level 2
Level 3 (= interrupt disable)
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.
describes this decision process.
Interrupt software priority
Interrupt software priority levels
RESTORE PC, X, A, CC
FROM STACK
RESET
HIGHEST HARDWARE
PRIORITY SERVICED
Doc ID 12370 Rev 8
Same
Y
INSTRUCTION
INTERRUPT
INSTRUCTION
FETCH NEXT
PENDING
EXECUTE
N
“IRET”
N
INTERRUPTS
SOFTWARE
PRIORITY
PENDING
Y
HIGHEST SOFTWARE
PRIORITY SERVICED
Low
High
STAYS PENDING
THE INTERRUPT
Level
Different
Interrupt has the same or a
LOAD I1:0 FROM INTERRUPT SW REG.
LOAD PC FROM INTERRUPT VECTOR
lower software priority
than current one
STACK PC, X, A, CC
1
1
0
I1
I1:0
TLI
N
0
1
0
1
Y
Interrupts
I0
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