参数资料
型号: ST92186B3BK
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封装: PLASTIC, SDIP-32
文件页数: 91/148页
文件大小: 1664K
代理商: ST92186B3BK
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ST92186B - 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 22 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 23 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 23. 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 PRIORITY LEVEL 2
INTERRUPT 3 HAS PRIORITY LEVEL 3
INTERRUPT 4 HAS PRIORITY LEVEL 4
INTERRUPT 5 HAS PRIORITY LEVEL 5
INT 2
INT 4
CPL=2
CPL=4
INT 5
CPL=5
MAIN
ei
INT 2
CPL=2
INT 6
CPL=6
INT5
INT2
ei
INTERRUPT 6 HAS PRIORITY LEVEL 6
INTERRUPT 0 HAS PRIORITY LEVEL 0
CPL6 > CPL3:
INT6 pending
CPL2 < CPL4:
Serviced just after ei
Priority Level of
Interrupt Request
ei
相关PDF资料
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ST92195B2T1/XXX 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP64
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