数据搜索系统，热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

预览 PDF HTML

DVR 数据表(PDF) 107 Page - Microchip Technology

部件名 DVR
功能描述  16-Bit General Purpose Microcontrollers with 256-Kbyte Flash and 16-Kbyte RAM in Low Pin Count Packages
PDF  416 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

DVR 数据表(HTML) 107 Page - Microchip Technology

Back Button DVR Datasheet HTML 103Page - Microchip Technology DVR Datasheet HTML 104Page - Microchip Technology DVR Datasheet HTML 105Page - Microchip Technology DVR Datasheet HTML 106Page - Microchip Technology DVR Datasheet HTML 107Page - Microchip Technology DVR Datasheet HTML 108Page - Microchip Technology DVR Datasheet HTML 109Page - Microchip Technology DVR Datasheet HTML 110Page - Microchip Technology DVR Datasheet HTML 111Page - Microchip Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 107 / 416 page
background image
 2016-2018 Microchip Technology Inc.
DS30010118D-page 107
PIC24FJ256GA705 FAMILY
A recommended code sequence for a clock switch
includes the following:
1.
Disable interrupts during the OSCCON register
unlock and write sequence.
2.
Execute the unlock sequence for the OSCCON
high byte by writing 78h and 9Ah to
OSCCON<15:8> in two back-to-back instructions.
3.
Write the new oscillator source to the NOSCx
bits in the instruction immediately following the
unlock sequence.
4.
Execute the unlock sequence for the OSCCON
low byte by writing 46h and 57h to OSCCON<7:0>
in two back-to-back instructions.
5.
Set the OSWEN bit in the instruction immediately
following the unlock sequence.
6.
Continue to execute code that is not clock-sensitive
(optional).
7.
Invoke an appropriate amount of software delay
(cycle counting) to allow the selected oscillator
and/or PLL to start and stabilize.
8.
Check to see if OSWEN is ‘0’. If it is, the switch
was successful. If OSWEN is still set, then
check the LOCK bit to determine the cause of
the failure.
The core sequence for unlocking the OSCCON register
and initiating a clock switch is shown in Example 9-1.
EXAMPLE 9-1:
BASIC CODE SEQUENCE
FOR CLOCK SWITCHING
;Place the new oscillator selection in W0
;OSCCONH (high byte) Unlock Sequence
MOV
#OSCCONH, w1
MOV
#0x78, w2
MOV
#0x9A, w3
MOV.b
w2, [w1]
MOV.b
w3, [w1]
;Set new oscillator selection
MOV.b
WREG, OSCCONH
;OSCCONL (low byte) unlock sequence
MOV
#OSCCONL, w1
MOV
#0x46, w2
MOV
#0x57, w3
MOV.b
w2, [w1]
MOV.b
w3, [w1]
;Start oscillator switch operation
BSET
OSCCON, #0



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100  ...More


数据表 下载

Go To PDF Page


链接网址



ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   数据表链接    |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com