C8051F960-B-GM Datasheet, PDF (218/492 Pages) Silicon Laboratories – Ultra Low Power 128K, LCD MCU Family

C8051F96x
SFR Definition 16.1. SFRPGCN: SFR Page Control
Bit
7
6
5
4
3
2
1
0
Name
SFRPGEN
Type
R
R
R
R
R
R
R
R/W
Reset
0
0
0
0
0
0
0
1
;SFR Page = 0xF; SFR Address = 0x8E
Bit Name
Function
7:1 Unused Read = 0000000b; Write = Don’t Care
0 SFRPGEN SFR Automatic Page Control Enable.
Upon interrupt, the C8051 Core will vector to the specified interrupt service routine.
This bit controls the automatic preservation and restoration of the SFRPAGE by hard-
ware.
0: SFR Automatic Paging disabled. The C8051 core will neither preserve the SRF-
PAGE upon entering an interrupt service routine, nor restore the SFRPAGE upon
exiting the interrupt service routine. The interrupt service routine should preserve and
restore the active SFRPAGE in firmware.
1: SFR Automatic Paging enabled. The C8051 core will preserve the SFRPAGE upon
entering an interrupt service routine and restore the SFRPAGE upon exiting the Inter-
rupt service routine. The firmware does not need to preserve and restore the SFRP-
AGE in the interrupt service routing. However, firmware must set the SFRPAGE
within the interrupt service routine before accessing SFRs.
218
Rev. 1.0