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ST90T158 Fiches technique(PDF) 54 Page - STMicroelectronics

No de pièce ST90T158
Description  8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM
Download  190 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST90T158 Fiches technique(HTML) 54 Page - STMicroelectronics

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ST90158 - INTERRUPTS
ARBITRATION MODES (Cont’d)
End of Interrupt Routine
The iret Interrupt Return instruction executes
the following steps:
– The Flag register is popped from system stack.
– If ENCSR is set, CSR is popped from system
stack.
– The PC high byte is popped from system stack.
– The PC low byte is popped from system stack.
– All unmasked Interrupts are enabled by setting
the CICR.IEN bit.
– The priority level of the interrupted routine is
popped from the special register (NICR) and
copied into CPL.
– If ENCSR is reset, CSR is used instead of ISR,
unless the program returns to another nested
routine.
The suspended routine thus resumes at the inter-
rupted instruction.
Figure 23 contains a simple example, showing that
if the ei instruction is not used in the interrupt
service routines, nested and concurrent modes
are equivalent.
Figure 24 contains a more complex example
showing how nested mode allows nested interrupt
processing (enabled inside the interrupt service
routinesi using the ei instruction) according to
their priority level.
Figure 24. Complex Example of a Sequence of Interrupt Requests with:
- Nested mode
- IEN set to 1 during the interrupt routine execution
INT 2
INT 3
CPL=3
INT 0
CPL=0
INT6
6
5
4
3
2
1
0
7
MAIN
INT 5
INT 4
INT0
INT4
INT3
INT2
CPL is set to 7
CPL=5
CPL=4
CPL=2
CPL=7
ei
INTERRUPT 2 HAS PRIORI TY LEVEL 2
INTERRUPT 3 HAS PRIORI TY LEVEL 3
INTERRUPT 4 HAS PRIORI TY LEVEL 4
INTERRUPT 5 HAS PRIORI TY LEVEL 5
INT 2
INT 4
CPL=2
CPL=4
INT 5
CPL=5
MAIN
ei
ei
INT 2
CPL=2
INT 6
CPL=6
INT5
INT2
ei
INTERRUPT 6 HAS PRIORI TY LEVEL 6
INTERRUPT 0 HAS PRIORI TY LEVEL 0
CPL6 > CPL3:
INT6 pending
CPL2 < CPL4:
Serviced just after ei
Priority Level of
Interrupt Request
ei
9


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