C8051F060_07 SILABS [Silicon Laboratories], C8051F060_07 Datasheet - Page 136
C8051F060_07
Manufacturer Part Number
C8051F060_07
Description
Mixed Signal ISP Flash MCU Family
Manufacturer
SILABS [Silicon Laboratories]
Datasheet
1.C8051F060_07.pdf
(328 pages)
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C8051F060/1/2/3/4/5/6/7
While in the ADC2 ISR, a PCA interrupt occurs. Recall the PCA interrupt is configured as a high priority
interrupt, while the ADC2 interrupt is configured as a low priority interrupt. Thus, the CIP-51 will now vector
to the high priority PCA ISR. Upon doing so, the CIP-51 will automatically place the SFR page needed to
access the PCA’s special function registers into the SFRPAGE register, SFR Page 0x00. The value that
was in the SFRPAGE register before the PCA interrupt (SFR Page 2 for ADC2) is pushed down the stack
into SFRNEXT. Likewise, the value that was in the SFRNEXT register before the PCA interrupt (in this
case SFR Page 0x0F for Port 5) is pushed down to the SFRLAST register, the “bottom” of the stack. Note
that a value stored in SFRLAST (via a previous software write to the SFRLAST register) will be overwritten.
See Figure 13.6 below.
136
Figure 13.6. SFR Page Stack Upon PCA Interrupt Occurring During an ADC2 ISR
SFRNEXT
SFRLAST
SFRPAGE
pushed to
SFRNEXT
pushed to
SFRPAGE on PCA
pushed on stack in
SFR Page 0x00
(ADC2)
(Port 5)
Automatically
(PCA)
0x0F
0x00
0x02
interrupt
Rev. 1.2
SFRPAGE
SFRNEXT
SFRLAST
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