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ST52T410 数据表(PDF) 32 Page - STMicroelectronics

部件名 ST52T410
功能描述  8-BIT INTELLIGENT CONTROLLER UNIT ICU Three Timer/PWMs, ADC, WDG
PDF  84 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST52T410 数据表(HTML) 32 Page - STMicroelectronics

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32/84
Figure 4.6 Example of a sequence of Interrupt requests
Note: The Interrupt priority must be fixed at the
beginning of the main program because at the
RESET
REG_CONF1=’00000000’
it
could
generate
erroneous
operations.
During
program execution the interrupt priority can
only be modified with the following procedure:
STEP 1:
Mask theinterruptsbymeansofaUDGI (or
MDGI) instruction
STEP 2:
Change the REG_CONF 1 values to modify the
interrupt priority
STEP 3:
Reset all the pending interrupt instructions by
means of RINT instructions.
STEP 4:
Unmask theinterruptsbymeansofaUEGI (or
MEGI) instruction
When a source provides an Interrupt request and
the request processing is also enabled, the CU
changes the normal sequential flow of a program
by transferring program control to a selected
service routine.
When an interrupt occurs the CU executes a JUMP
instruction to the address loaded in the related
location of the Interrupt Vector.
When the execution returns to the original program
it immediately begins following the instruction that
was interrupted.
(*) ST52x420 only
Table 4.4 RINT Instruction code
Peripheral Name
Value
INT_ADC (*)
0
PWM/TIMER 0
1
PWM/TIMER 1
2
PWM/TIMER 2
3
INT_EXT
4
MAIN PROGRAM
5
4
3
2
1
0
PRI2
PRI0
PRI2
PRI1
PRI2
PRI3
PRI4
MAIN PROGRAM
PRIORITY
LEVEL
PRI2
PRI0
PRI4
PRI1
PRI3



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