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AT91 Datasheet(PDF) 72 Page - ATMEL Corporation

Part # AT91
Description  ARM® Thumb® Microcontrollers
PDF  153 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91 Datasheet(HTML) 72 Page - ATMEL Corporation

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72
AT91X40 Series
1354D–ATARM–08/02
SPSR, masking or unmasking the interrupts depending on the state saved in the
SPSR (the previous state of the ARM core).
Note:
The I bit in the SPSR is significant. If it is set, it indicates that the ARM core was just
about to mask IRQ interrupts when the mask instruction was interrupted. Hence, when
the SPSR is restored, the mask instruction is completed (IRQ is masked).



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