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ST72324BJ2 Datasheet(PDF) 41 Page - STMicroelectronics

Part # ST72324BJ2
Description  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
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72324BJ2 Datasheet(HTML) 41 Page - STMicroelectronics

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ST72324B
Interrupts
41/188
7.5.2
Interrupt software priority registers (ISPRx)
These four registers contain the interrupt software priority of each interrupt vector.
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 Table 16.
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 (for example, previous value = CFh, write = 64h, result = 44h).
The reset, and TRAP vectors have no software priorities. When one is serviced, the I1 and
I0 bits of the CC register are both set.
Caution:
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.
Otherwise, the software priority stays unchanged up to the next interrupt request (after the
IRET of the interrupt x).
ISPRx
Reset value: 1111 1111 (FFh)
7654321
0
ISPR0
I1_3
I0_3
I1_2
I0_2
I1_1
I0_1
I1_0
I0_0
ISPR1
I1_7
I0_7
I1_6
I0_6
I1_5
I0_5
I1_4
I0_4
ISPR2
I1_11
I0_11
I1_10
I0_10
I1_9
I0_9
I1_8
I0_8
R/WR/W
R/WR/W
R/WR/W
R/W
R/W
ISPR3
1111
I1_13
I0_13
I1_12
I0_12
RO
RO
RO
RO
R/W
R/W
R/W
R/W
Table 16.
ISPRx interrupt vector correspondence
Vector address
ISPRx bits
FFFBh-FFFAh
I1_0 and I0_0 bits
FFF9h-FFF8h
I1_1 and I0_1 bits
...
...
FFE1h-FFE0h
I1_13 and I0_13 bits
Table 17.
Dedicated interrupt instruction set(1)
Instruction
New description
Function/example
I1
H
I0
N
Z
C
HALT
Entering HALT mode
1
0
IRET
Interrupt routine return
POP CC, A, X, PC
I1
H
I0
N
Z
C
JRM
Jump if I1:0=11 (level 3)
I1:0=11 ?
JRNM
Jump if I1:0<>11
I1:0<>11 ?


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