C8051F970-A-GM Datasheet, PDF (186/454 Pages) Silicon Laboratories – Low Power Capacitive Sensing MCU with up to 32 kB of Flash

C8051F97x
Register 20.10. SFRLAST: SFR Page Last
Bit
7
6
5
4
3
2
1
0
Name
SFRLAST
Type
RW
Reset
0
0
0
0
0
0
0
0
SFR Page = ALL; SFR Address: 0xB3
Table 20.11. SFRLAST Register Bit Descriptions
Bit
Name
Function
7:0 SFRLAST SFR Page Last.
This is the value that will go to the SFRNEXT register upon a return from interrupt.
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.
Rev 1.0
187