c8051t617 Silicon Laboratories, c8051t617 Datasheet - Page 111

• Manufacturer Part Number: c8051t617
• Description: Mixed Signal Byte-programmable Eprom Mcu
• Manufacturer: Silicon Laboratories

SFR Definition 13.1. OSCICL: Internal Oscillator Calibration
SFR Definition 13.2. OSCICN: Internal Oscillator Control
Bit7:
Bits 6–0: OSCICL: Internal Oscillator Calibration Register.
Bit7:
Bit6:
Bits5–2: UNUSED. Read = 0000b, Write = don't care.
Bits1–0: IFCN1-0: Internal Oscillator Frequency Control Bits.
IOSCEN
R/W
R/W
Bit7
Bit7
-
UNUSED. Read = 0. Write = don’t care.
This register determines the internal oscillator period. This reset value for OSCICL deter-
mines the oscillator base frequency. The reset value is factory calibrated to generate an
internal oscillator frequency of 24.5 MHz.
IOSCEN: Internal Oscillator Enable Bit.
0: Internal Oscillator Disabled.
1: Internal Oscillator Enabled.
IFRDY: Internal Oscillator Frequency Ready Flag.
0: Internal Oscillator is not running at programmed frequency.
1: Internal Oscillator is running at programmed frequency.
00: SYSCLK derived from Internal Oscillator divided by 8.
01: SYSCLK derived from Internal Oscillator divided by 4.
10: SYSCLK derived from Internal Oscillator divided by 2.
11: SYSCLK derived from Internal Oscillator divided by 1.
IFRDY
R/W
Bit6
Bit6
R
R/W
R/W
Bit5
Bit5
-
R/W
R/W
Bit4
Bit4
-
Rev. 0.3
R/W
R/W
Bit3
Bit3
-
C8051T610/1/2/3/4/5/6/7
R/W
R/W
Bit2
Bit2
-
IFCN1
R/W
R/W
Bit1
Bit1
IFCN0
R/W
R/W
Bit0
Bit0
SFR Address:
SFR Address:
Reset Value
11000000
Reset Value
Variable
0xB2
0xB3
111