dsPIC30F1010/202X
DS70178C-page 204
Preliminary
2006 Microchip Technology Inc.
REGISTER 18-6:
FOSC: OSCILLATOR SELECTION CONFIGURATION BITS
U-0
bit 23
bit 16
U-0
bit 15
bit 8
R/P
U-0
R/P
FCKSM<1:0>
FRANGE
OSCIOFNC
POSCMD<1:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-8
Unimplemented: Read as ‘0’
bit 7-6
FCKSM<1:0>: Clock Switching and Monitor Selection Configuration bits
1x
= Clock switching is disabled, fail-safe clock monitor is disabled
01
= Clock switching is enabled, fail-safe clock monitor is disabled
00
= Clock switching is enabled, fail-safe clock monitor is enabled
bit 5
FRANGE: Frequency Range Select for FRC and PLL bit
Acts like a “Gear Shift” feature that enables the dsPIC DSC device to operate at reduced MIPS at a
reduced supply voltage (3.3V)
FRANGE
Bit Value
Temperature
Rating
FRC Frequency
(Nominal)
PLL VCO
(Nominal)
1
= High Range
Industrial
Extended
14.55 MHz
9.7 MHz
466 MHz (480 MHz max.)
310 MHz (320 MHz max.)
0
= Low Range
Industrial
Extended
9.7 MHz
6.4 MHz
310 MHz (320 MHz max.)
205 MHz (211 MHz max.)
bit 4-3
Unimplemented: Read as ‘0’
bit 3
OSCIOFNC: OSC2 Pin I/O Enable bit
1
= CLKO output signal active on the OSCO pin
0
= CLKO output disabled
bit 1-0
POSCMD<1:0>: Primary Oscillator Mode
11
= Primary Oscillator Disabled
10
= HS oscillator mode selected
01
= Reserved
00
= External clock mode selected
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