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C8051F54X Datasheet(PDF) 100 Page - Silicon Laboratories |
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C8051F54X Datasheet(HTML) 100 Page - Silicon Laboratories |
100 / 276 page C8051F54x Rev. 1.1 99 SFR Address = 0xA7; SFR Page = All Pages SFR Definition 12.4. SFRLAST: SFR Last Bit 7 6 5 4 3 2 1 0 Name SFRLAST[7:0] Type R/W Reset 0 0 0 0 0 0 0 0 Bit Name Function 7:0 SFRLAST[7:0] SFR Page Stack Bits. This is the value that will go to the SFRNEXT register upon a return from inter- rupt. Write: Sets the SFR Page in the last entry of the SFR Stack. This will cause the SFRNEXT SFR to have this SFR page value upon a return from interrupt. Read: Returns the value of the SFR page contained in the last entry of the SFR stack. SFR page context is retained upon interrupts/return from interrupts in a 3 byte SFR Page Stack: SFRPAGE is the first entry, SFRNEXT is the second, and SFRLAST is the third entry. The SFR stack bytes may be used alter the context in the SFR Page Stack, and will not cause the stack to “push” or “pop”. Only interrupts and return from interrupts cause pushes and pops of the SFR Page Stack. |
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