Microchip Technology AC164139 데이터 시트
PIC24FJ256DA210 FAMILY
DS39969B-page 350
2010 Microchip Technology Inc.
REGISTER 27-2:
CW2: FLASH CONFIGURATION WORD 2
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 23
bit 16
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
IESO
PLLDIV2
PLLDIV1
PLLDIV0
PLL96MHZ
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
reserved
reserved
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 14-12
PLLDIV<2:0>: 96 MHz PLL Prescaler Select bits
111
= Oscillator input is divided by 12 (48 MHz input)
110
= Oscillator input is divided by 8 (32 MHz input)
101
= Oscillator input is divided by 6 (24 MHz input)
100
= Oscillator input is divided by 5 (20 MHz input)
011
= Oscillator input is divided by 4 (16 MHz input)
010
= Oscillator input is divided by 3 (12 MHz input)
001
= Oscillator input is divided by 2 (8 MHz input)
000
= Oscillator input is used directly (4 MHz input)
bit 11
PLL96MHZ: 96 MHz PLL Start-Up Enable bit
1
= 96 MHz PLL is enabled automatically on start-up
0
= 96 MHz PLL is software controlled (can be enabled by setting the PLLEN bit in CLKDIV<5>)
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
If POSCMD<1:0> = 11 or 00:
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.