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PIC12F1516 数据表(PDF) 61 Page - Microchip Technology

部件名 PIC12F1516
功能描述  28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
Download  344 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

PIC12F1516 数据表(HTML) 61 Page - Microchip Technology

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 2011 Microchip Technology Inc.
Preliminary
DS41452B-page 61
PIC16(L)F1516/7/8/9
5.4.2
TWO-SPEED START-UP
SEQUENCE
1.
Wake-up from Power-on Reset or Sleep.
2.
Instructions begin execution by the internal
oscillator at the frequency set in the IRCF<3:0>
bits of the OSCCON register.
3.
OST enabled to count 1024 clock cycles.
4.
OST timed out, wait for falling edge of the
internal oscillator.
5.
OSTS is set.
6.
System clock held low until the next falling edge
of new clock (LP, XT or HS mode).
7.
System clock is switched to external clock
source.
5.4.3
CHECKING TWO-SPEED CLOCK
STATUS
Checking the state of the OSTS bit of the OSCSTAT
register will confirm if the microcontroller is running
from the external clock source, as defined by the
FOSC<2:0> bits in the Configuration Word 1, or the
internal oscillator.
FIGURE 5-8:
TWO-SPEED START-UP
0
1
1022 1023
PC + 1
TOST
T
INTOSC
OSC1
OSC2
Program Counter
System Clock
PC - N
PC


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