C8051F360 datasheet(91/288 Pages) SILABS

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0x00

(ADC0)

0x0F

(OSCICN)

SFRPAGE

SFRLAST

SFRNEXT

SFRPAGE

pushed to

SFRNEXT

SFR Page 0x00

Automatically

pushed on stack in

SFRPAGE on ADC0

interrupt

Rev. 1.0

C8051F360/1/2/3/4/5/6/7/8/9

Figure 9.5. SFR Page Stack After ADC0 Window Comparator Interrupt Occurs

While in the ADC0 ISR, a PCA interrupt occurs. Recall the PCA interrupt is configured as a high priority

interrupt, while the ADC0 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 SFR page 0x00 into the

SFRPAGE register. The value that was in the SFRPAGE register before the PCA interrupt (SFR Page 0x00

for ADC0) 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 OSCICN) is pushed down to the SFRLAST reg-

ister, 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 9.6 below.

0x00

(PCA)

0x00

(ADC0)

0x0F

(OSCICN)

SFRPAGE

SFRLAST

SFRNEXT

SFR Page 0x00

Automatically

pushed on stack in

SFRPAGE on PCA

interrupt

SFRPAGE

pushed to

SFRNEXT

pushed to

SFRLAST

Figure 9.6. SFR Page Stack Upon PCA Interrupt Occurring During an ADC0 ISR

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