參數(shù)資料
型號: EA-EDU-009
廠商: Embedded Artists
文件頁數(shù): 30/37頁
文件大小: 0K
描述: BOARD EDUCATION LPC2103
標(biāo)準(zhǔn)包裝: 1
類型: MCU
適用于相關(guān)產(chǎn)品: LPC2103
所含物品:
PIC18F85J90 FAMILY
DS39770C-page 36
2010 Microchip Technology Inc.
3.2
Control Registers
The OSCCON register (Register 3-1) controls the main
aspects of the device clock’s operation. It selects the
oscillator type to be used, which of the power-managed
modes to invoke and the output frequency of the
INTOSC source. It also provides status on the
oscillators.
The OSCTUNE register (Register 3-2) controls the
tuning and operation of the internal oscillator block. It
also implements the PLLEN bits, which control the
operation of the Phase Locked Loop (PLL) in Internal
Oscillator modes (see Section 3.4.3 “PLL Frequency
REGISTER 3-1:
OSCCON: OSCILLATOR CONTROL REGISTER
R/W-0
R/W-1
R/W-0
R(1)
R-0
R/W-0
IDLEN
IRCF2(2)
IRCF1(2)
IRCF0(2)
OSTS
IOFS
SCS1(4)
SCS0(4)
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 7
IDLEN: Idle Enable bit
1
= Device enters an Idle mode when a SLEEP instruction is executed
0
= Device enters Sleep mode when a SLEEP instruction is executed
bit 6-4
IRCF<2:0>: INTOSC Source Frequency Select bits(2)
111
= 8 MHz (INTOSC drives clock directly)
110
= 4 MHz
101
= 2 MHz
100
= 1 MHz (default)
011
= 500 kHz
010
= 250 kHz
001
= 125 kHz
000
= 31 kHz (from either INTOSC/256 or INTRC)(3)
bit 3
OSTS: Oscillator Start-up Time-out Status bit(1)
1
= Oscillator Start-up Timer (OST) time-out has expired; primary oscillator is running
0
= Oscillator Start-up Timer (OST) time-out is running; primary oscillator is not ready
bit 2
IOFS: INTOSC Frequency Stable bit
1
= Fast RC oscillator frequency is stable
0
= Fast RC oscillator frequency is not stable
bit 1-0
SCS<1:0:> System Clock Select bits(4)
11
= Internal oscillator block
10
= Primary oscillator
01
= Timer1 oscillator
When FOSC2 = 1:
00
= Primary oscillator
When FOSC2 = 0:
00
= Internal oscillator
Note 1:
Reset state depends on state of the IESO Configuration bit.
2:
Modifying these bits will cause an immediate clock frequency switch if the internal oscillator is providing
the device clocks.
3:
Source selected by the INTSRC bit (OSCTUNE<7>), see text.
4:
Modifying these bits will cause an immediate clock source switch.
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