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Rev. 1.6
119
C8051F310/1/2/3/4/5/6/7
SFR Definition 12.3. CLKSEL: Clock Select
Table 12.1. Internal Oscillator Electrical Characteristics
VDD = 2.7 to 3.6 V; –40 to +85 °C unless otherwise specified.
Parameter
Conditions
Min
Typ
Max
Units
Internal Oscillator Frequency
24
24.5
25
MHz
Internal Oscillator Supply
Current (from VDD)
OSCICN.7 = 1
—
450
1000
µA
Bits7–1: Reserved. Read = 0000000b, Must Write = 0000000.
Bit0:
CLKSL0: System Clock Source Select Bit.
0: SYSCLK derived from the Internal Oscillator, and scales per the IFCN bits in register
OSCICN.
1: SYSCLK derived from the External Oscillator circuit.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
Reserved Reserved Reserved Reserved Reserved Reserved Reserved
CLKSL0
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0xA9