C8051F045 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F045

Mixed Signal ISP Flash MCU Family

Silicon Laboratories 

C8051F040/1/2/3/4/5/6/7

SFRNEXT

popped to

SFRPAGE

SFRLAST

popped to

SFRNEXT

SFR Page 0x00

Automatically

popped off of the

stack on return from

interrupt

0x02

(ADC2)

0x0F

(Port 5)

SFRPAGE

SFRNEXT

SFRLAST

Figure 12.7. SFR Page Stack Upon Return From PCA Interrupt

On the execution of the RETI instruction in the ADC2 Window Comparator ISR, the value in SFRPAGE

register is overwritten with the contents of SFRNEXT. The CIP-51 may now access the Port 5 SFR bits as

it did prior to the interrupts occurring. See Figure 12.8 below.

140

Rev. 1.5

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