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EM6812F2TP24B датащи(PDF) 70 Page - EM Microelectronic - MARIN SA

номер детали EM6812F2TP24B
подробное описание детали  Ultra Low Power 8-bit FLASH Microcontroller
PDF  81 Pages
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производитель  EMMICRO [EM Microelectronic - MARIN SA]
домашняя страница  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6812F2TP24B датащи(HTML) 70 Page - EM Microelectronic - MARIN SA

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14.3.4 Processor vector table
Address 1,2 and 3 of the program memory are reserved for interrupt subroutine calls. Generally the first four addresses of
the program memory are reserved for the processor vector table. The address 0 of the program memory contains the jump
to the start-up routine
Table 61. Processor vector table
Address
Accessed by
Description
Priority
0
ResCPU
Any reset, start-up address
Maximal, above interrupts
1
IN1
Interrupt level 1
medium
2
IN2
Interrupt level 2
low
3
IN3
Interrupt level 0
high
14.3.5 Context Saving
Since an interrupt may occur any time during normal program execution, there is no way to know which processor registers
are used by the user program. For this reason, all resources modified in the interrupt service routine have to be saved upon
entering and restored when leaving the service routine. The flags(C,V) and the accumulator (A) must always be saved,
since most instructions will modify them. Other registers need only to be saved when they are modified in the interrupt
service routine. There is a particular way to follow when saving resources. The accumulator should be saved first, followed
by the flags and then the other registers



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