Microchip Technology MA240029 データシート
PIC24FJ128GA310 FAMILY
DS39996F-page 336
2010-2011 Microchip Technology Inc.
REGISTER 29-2:
CW2: FLASH CONFIGURATION WORD 2
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
R/PO-1
r-1
r-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
IESO
r
r
ALTVRF1
ALTVRF0
FNOSC2
FNOSC1
FNOSC0
bit 15
bit 8
R/PO-1
R/PO-1
R/PO-1
R/PO-1
r-1
r-1
R/PO-1
R/PO-1
FCKSM1
FCKSM0
OSCIOFCN
IOL1WAY
r
r
POSCMD1
POSCMD0
bit 7
bit 0
Legend:
r = Reserved bit
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 23-16
Unimplemented:
Read as ‘1’
bit 15
IESO:
Internal External Switchover bit
1
= IESO mode (Two-Speed Start-up) is enabled
0
= IESO mode (Two-Speed Start-up) is disabled
bit 14-13
Reserved:
Always maintain as ‘1’
bit 12-11
ALTVRF<1:0>:
Alternate V
REF
/CV
REF
Pins Selection bits
00
= Voltage reference input, A/D = RB0/RB1, Comparator = RB0/RB1
01
= Voltage reference input, A/D = RB0/RB1, Comparator = RA9, RA10
10
= Voltage reference input, A/D = RA9/RA10, Comparator = RB0, RB1
11
= Voltage reference input, A/D = RA9/RA10, Comparator = RA9, RA10
bit 10-8
FNOSC<2:0>:
Initial Oscillator Select bits
111
= Fast RC Oscillator with Postscaler (FRCDIV)
110
= Reserved
101
= Low-Power RC Oscillator (LPRC)
100
= Secondary Oscillator (SOSC)
011
= Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)
010
= Primary Oscillator (XT, HS, EC)
001
= Fast RC Oscillator with Postscaler and PLL module (FRCPLL)
000
= Fast RC Oscillator (FRC)
bit 7-6
FCKSM<1:0>:
Clock Switching and Fail-Safe Clock Monitor Configuration bits
1x
= Clock switching and Fail-Safe Clock Monitor are 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
OSCIOFCN:
OSCO Pin Configuration bit
If POSCMD<1:0> = 11 or 00:
1
1
= OSCO/CLKO/RC15 functions as CLKO (F
OSC
/2)
0
= OSCO/CLKO/RC15 functions as port I/O (RC15)
If POSCMD<1:0> = 10 or 01:
OSCIOFCN has no effect on OSCO/CLKO/RC15.
OSCIOFCN has no effect on OSCO/CLKO/RC15.
bit 4
IOL1WAY:
IOLOCK One-Way Set Enable bit
1
= The IOLOCK bit (OSCCON<6>) can be set once, provided the unlock sequence has been
completed. Once set, the Peripheral Pin Select registers cannot be written to a second time.
0
= The IOLOCK bit can be set and cleared as needed, provided the unlock sequence has been
completed