PIC16F721-ESS 查看數據表（PDF） - Microchip Technology
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PIC16F721-ESS Datasheet PDF : 254 Pages
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PIC16(L)F720/721
7.4 Oscillator Control
The Oscillator Control (OSCCON) register (Figure 7-1)
displays the status and allows frequency selection of the
internal oscillator (INTOSC) system clock. The
OSCCON register contains the following bits:
• Frequency selection bits (IRCF)
• Status Locked bits (ICSL)
• Status Stable bits (ICSS)
REGISTER 7-1: OSCCON: OSCILLATOR CONTROL REGISTER
U-0
—
bit 7
U-0
R/W-1
R/W-0
R-q
R-q
U-0
—
IRCF1
IRCF0
ICSL
ICSS
—
U-0
—
bit 0
Legend:
R = Readable bit
W = Writable bit
-n = Value at POR
‘1’ = Bit is set
q = Value depends on condition
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
bit 5-4
bit 3
bit 2
bit 1-0
Unimplemented: Read as ‘0’
IRCF<1:0>: Internal Oscillator Frequency Select bits
When PLLEN = 1 (16 MHz HFINTOSC)
11 = 16 MHz
10 = 8 MHz (default)
01 = 4 MHz
00 = 2 MHz
When PLLEN = 0 (500 kHz MFINTOSC)
11 = 500 kHz
10 = 250 kHz (default)
01 = 125 kHz
00 = 62.5 kHz
ICSL: Internal Clock Oscillator Status Locked bit (2% Stable)
1 = 16 MHz/500 kHz internal oscillator is in lock
0 = 16 MHz/500 kHz internal oscillator has not yet locked
ICSS: Internal Clock Oscillator Status Stable bit (0.5% Stable)
1 = 16 MHz/500 kHz internal oscillator has stabilized to its maximum accuracy
0 = 16 MHz/500 kHz internal oscillator has not yet reached its maximum accuracy
Unimplemented: Read as ‘0’
2010-2013 Microchip Technology Inc.
DS41430D-page 67
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