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C8051F54X Datasheet(PDF) 94 Page - Silicon Laboratories |
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C8051F54X Datasheet(HTML) 94 Page - Silicon Laboratories |
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94 / 276 page  C8051F54x Rev. 1.1 93 Figure 12.4. SFR Page Stack Upon PCA Interrupt Occurring During a SPI0 ISR On exit from the PCA interrupt service routine, the CIP-51 will return to the SPI0 ISR. On execution of the RETI instruction, SFR Page 0x00 used to access the PCA registers will be automatically popped off of the SFR Page Stack, and the contents of the SFRNEXT register will be moved to the SFRPAGE register. Soft- ware in the SPI0 ISR can continue to access SFRs as it did prior to the PCA interrupt. Likewise, the con- tents of SFRLAST are moved to the SFRNEXT register. Recall this was the SFR Page value 0x0F being used to access SMB0ADR before the SPI0 interrupt occurred. See Figure 12.5. 0x00 (PCA0) 0x00 (SPI0) 0x0F (SMB0ADR) SFRPAGE SFRLAST SFRNEXT SFR Page 0x00 Automatically pushed on stack in SFRPAGE on PCA interrupt SFRPAGE pushed to SFRNEXT SFRNEXT pushed to SFRLAST |
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