C8051F50x-F51x
SFR Definition 13.4. SFRLAST: SFR Last
Bit
7
6
5
4
3
2
1
0
SFRLAST[7:0]
R/W
Name
Type
Reset
0
0
0
0
0
0
0
0
SFR Address = 0xA7; SFR Page = All Pages
Bit Name
7:0 SFRLAST[7:0] SFR Page Stack Bits.
Function
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.
110
Rev. 1.1
SILICON [ SILICON ]
