C8051F980-C-GM Datasheet, PDF (194/325 Pages) Silicon Laboratories – Ultra Low Power, 8-2 kB Flash, Capacitive Sensing MCU

C8051F99x-C8051F98x
SFR Definition 19.2. OSCICN: Internal Oscillator Control
Bit
7
Name IOSCEN
Type ^R/W
Reset
0
6
IFRDY
R
0
5
R/W
Varies
4
R/W
Varies
3
2
Reserved[5:0]
R/W
R/W
Varies
Varies
1
R/W
Varies
0
R/W
Varies
SFR Page = 0x0; SFR Address = 0xB2
Bit Name
Function
7 IOSCEN Internal Oscillator Enable.
0: Internal oscillator disabled.
1: Internal oscillator enabled.
6
IFRDY Internal Oscillator Frequency Ready Flag.
0: Internal oscillator is not running at its programmed frequency.
1: Internal oscillator is running at its programmed frequency.
5:0 Reserved Must perform read-modify-write.
Notes:
1. Read-modify-write operations such as ORL and ANL must be used to set or clear the enable bit of this
register.
2. OSCBIAS (REG0CN.4) must be set to 1 before enabling the precision internal oscillator.
194
Rev. 1.2