SAM3A4C Atmel Corporation, SAM3A4C Datasheet - Page 170
SAM3A4C
Manufacturer Part Number
SAM3A4C
Description
Manufacturer
Atmel Corporation
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• RETTOBASE
RO
Indicates whether there are preempted active exceptions:
0: there are preempted active exceptions to execute
1: there are no active exceptions, or the currently-executing exception is the only active exception.
• VECTACTIVE
RO
Contains the active exception number:
0: Thread mode
Nonzero = The exception number
Subtract 16 from this value to obtain the IRQ number required to index into the Interrupt Clear-Enable, Set-Enable, Clear-
Pending, Set-Pending, or Priority Registers, see
When you write to the ICSR, the effect is Unpredictable if you:
Note:
170
170
• write 1 to the PENDSVSET bit and write 1 to the PENDSVCLR bit
• write 1 to the PENDSTSET bit and write 1 to the PENDSTCLR bit.
1. This is the same value as IPSR bits [8:0] see
SAM3X/A
SAM3X/A
(1)
of the currently active exception.
“Interrupt Program Status Register” on page
“Interrupt Program Status Register” on page
61.
61.
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
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