TOOLSTICK542PP Silicon Laboratories Inc, TOOLSTICK542PP Datasheet - Page 93
TOOLSTICK542PP
Manufacturer Part Number
TOOLSTICK542PP
Description
PLATFORM PROG TOOLSTICK F542
Manufacturer
Silicon Laboratories Inc
Series
ToolStickr
Type
Microcontroller Programmerr
Specifications of TOOLSTICK542PP
Contents
2 Boards and USB Connecting Cable
Processor To Be Evaluated
C8051F542
Interface Type
USB
Operating Supply Voltage
2.7 V to 3.6 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F542
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1718
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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.
Figure 12.4. SFR Page Stack Upon PCA Interrupt Occurring During a SPI0 ISR
SFRPAGE
SFRNEXT
SFRNEXT
pushed to
SFRLAST
pushed to
(SMB0ADR)
SFRPAGE on PCA
pushed on stack in
SFR Page 0x00
(PCA0)
Automatically
(SPI0)
0x0F
0x00
0x00
interrupt
Rev. 1.1
SFRPAGE
SFRNEXT
SFRLAST
C8051F54x
93
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