ST72521 STMICROELECTRONICS [STMicroelectronics], ST72521 Datasheet - Page 37
ST72521
Manufacturer Part Number
ST72521
Description
8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.ST72521.pdf
(211 pages)
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Quantity
Price
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Part Number:
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Manufacturer:
ST
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INTERRUPTS (Cont’d)
Table 6. Dedicated Interrupt Instruction Set
Note: During the execution of an interrupt routine, the HALT, POPCC, RIM, SIM and WFI instructions change the current
software priority up to the next IRET instruction or one of the previously mentioned instructions.
Instruction
HALT
IRET
JRM
JRNM
POP CC
RIM
SIM
TRAP
WFI
Entering Halt mode
Interrupt routine return
Jump if I1:0=11 (level 3)
Jump if I1:0<>11
Pop CC from the Stack
Enable interrupt (level 0 set)
Disable interrupt (level 3 set)
Software trap
Wait for interrupt
New Description
Pop CC, A, X, PC
I1:0=11 ?
I1:0<>11 ?
Mem => CC
Load 10 in I1:0 of CC
Load 11 in I1:0 of CC
Software NMI
Function/Example
I1
I1
I1
1
1
1
1
1
H
H
H
I0
I0
I0
0
0
1
1
0
N
N
N
ST72521
Z
Z
Z
37/211
C
C
C
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