ST72325R6-AUTO STMicroelectronics, ST72325R6-AUTO Datasheet - Page 64

• Manufacturer Part Number: ST72325R6-AUTO
• Description: 8-bit Mcu For Automotive With 16 To 60 Kbyte Flash, Adc, Css, 5 Timers, Spi, Sci, I2c Interface
• Manufacturer: STMicroelectronics

Interrupts
7.5.2
Caution:
64/250
Table 17.
1. TRAP and RESET events can interrupt a level 3 program.
Interrupt software priority registers (ISPRx)
These four registers are read/write, with the exception of bits 7:4 of ISPR3, which are read
only.
These four registers contain the interrupt software priority of each interrupt vector.
●
Table 18.
1. Bits in the ISPRx registers which correspond to the TLI can be read and written but they are not significant
●
●
The TLI, RESET, and TRAP vectors have no software priorities. When one is serviced, the
I1 and I0 bits of the CC register are both set.
If the I1_x and I0_x bits are modified while the interrupt x is executed the following behavior
has to be considered: If the interrupt x is still pending (new interrupt or flag not cleared) and
the new software priority is higher than the previous one, the interrupt x is re-entered.
Level 0 (main)
Level 1
Level 2
Level 3 (= interrupt disable
ISPRx
in the interrupt process management.
Each interrupt vector (except RESET and TRAP) has corresponding bits in these
registers where its own software priority is stored. This correspondence is shown in the
following
Each I1_x and I0_x bit value in the ISPRx registers has the same meaning as the I1
and I0 bits in the CC register.
Level 0 cannot be written (I1_x = 1, I0_x = 0). In this case, the previously stored value
is kept (Example: previous = CFh, write = 64h, result = 44h).
ISPR0
ISPR1
ISPR2
ISPR3
Interrupt software priority
Interrupt software priority levels
Interrupt priority bits
Table
Vector address
FFFBh-FFFAh
FFE1h-FFE0h
FFF9h-FFF8h
I1_11
I1_3
I1_7
18.
7
1
...
(1)
)
I0_11
I0_3
I0_7
6
1
I1_10
I1_2
I1_6
5
1
I0_10
I0_2
I0_6
4
1
Level
High
Low
I1_13
I1_1
I1_5
I1_9
3
I1_13 and I0_13 bits
I1_0 and I0_0 bits
I1_1 and I0_1 bits
ISPRx bits
Reset value: 1111 1111 (FFh)
I0_13
I0_9
I0_1
I0_5
2
...
I1
1
0
0
1
ST72325xxx-Auto
I1_12
I1_8
I1_0
I1_4
(1)
1
I0
0
1
0
1
I0_12
I0_0
I0_4
I0_8
0