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C8051F54X Datasheet(PDF) 96 Page - Silicon Laboratories |
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C8051F54X Datasheet(HTML) 96 Page - Silicon Laboratories |
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96 / 276 page  C8051F54x Rev. 1.1 95 Figure 12.6. SFR Page Stack Upon Return From SPI0 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 12.1. 0x0F (SMB0ADR) SFRPAGE SFRLAST SFRNEXT SFR Page 0x00 Automatically popped off of the stack on return from interrupt SFRNEXT popped to SFRPAGE |
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