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C8051F54X Datasheet(PDF) 100 Page - Silicon Laboratories

Part # C8051F54X
Description  Mixed Signal ISP Flash MCU Family
Download  276 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

C8051F54X Datasheet(HTML) 100 Page - Silicon Laboratories

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C8051F54x
Rev. 1.1
99
SFR Address = 0xA7; SFR Page = All Pages
SFR Definition 12.4. SFRLAST: SFR Last
Bit
7
6
5
4
3
2
1
0
Name
SFRLAST[7:0]
Type
R/W
Reset
0
0
0
0
0
0
0
0
Bit
Name
Function
7:0
SFRLAST[7:0]
SFR Page Stack Bits.
This is the value that will go to the SFRNEXT register upon a return from inter-
rupt.
Write: Sets the SFR Page in the last entry of the SFR Stack. This will cause the
SFRNEXT SFR to have this SFR page value upon a return from interrupt.
Read: Returns the value of the SFR page contained in the last entry of the SFR
stack.
SFR page context is retained upon interrupts/return from interrupts in a 3 byte
SFR Page Stack: SFRPAGE is the first entry, SFRNEXT is the second, and
SFRLAST is the third entry. The SFR stack bytes may be used alter the context
in the SFR Page Stack, and will not cause the stack to “push” or “pop”. Only
interrupts and return from interrupts cause pushes and pops of the SFR Page
Stack.


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