C8051F581-IMR Silicon Labs, C8051F581-IMR Datasheet - Page 112
C8051F581-IMR
Manufacturer Part Number
C8051F581-IMR
Description
8-bit Microcontrollers - MCU 50MIPS 128kB 8kB SPI
Manufacturer
Silicon Labs
Datasheet
1.C8051F585-IQR.pdf
(356 pages)
Specifications of C8051F581-IMR
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
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C8051F58x/F59x
SFR Page 0xC
Automatically
popped off of the
stack on return from
interrupt
0x0
SFRPAGE
(SPI0DAT)
SFRNEXT
popped to
SFRPAGE
SFRNEXT
SFRLAST
Figure 13.6. SFR Page Stack Upon Return From CAN0 Interrupt
In the example above, all three bytes in the SFR Page Stack are accessible via the SFRPAGE, SFRNEXT,
and SFRLAST special function registers. If the stack is altered while servicing an interrupt, it is possible to
return to a different SFR Page upon interrupt exit than selected prior to the interrupt call. Direct access to
the SFR Page stack can be useful to enable real-time operating systems to control and manage context
switching between multiple tasks.
Push operations on the SFR Page Stack only occur on interrupt service, and pop operations only occur on
interrupt exit (execution on the RETI instruction). The automatic switching of the SFRPAGE and operation
of the SFR Page Stack as described above can be disabled in software by clearing the SFR Automatic
Page Enable Bit (SFRPGEN) in the SFR Page Control Register (SFR0CN). See SFR Definition 13.1.
112
Rev. 1.2
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