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68HC705SP7 bảng dữ liệu(PDF) 126 Page - NXP Semiconductors

tên linh kiện 68HC705SP7
Giải thích chi tiết về linh kiện  Low-Cost, HC05 Core MCU in 20-Pin Package (MC68HC705JJ7) or 28-Pin Package (MC68HC705JP7)
PDF  230 Pages
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nhà sản xuất  NXP [NXP Semiconductors]
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68HC705SP7 bảng dữ liệu(HTML) 126 Page - NXP Semiconductors

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Analog Subsystem
General Release Specification
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
Analog Subsystem
Figure 8-10. A/D Conversion — TOF/ICF Control (Mode 2)
tDIS
(MIN)
tCHG x ICHG
CEXT
tCHG
tDIS
VX =
VMAX
CHG
COMP2
0
TOF
OCF
ICF
(MIN)
VCAP
tDIS
VX
1
2
3
1
2
(TCAP)
Point
Action
Software/Hardware Action
Dependent Variable(s)
0
Begin initial discharge and select mode
2 by clearing CHG and ATD1 and
setting ATD2 in the ACR. Also set
ICEN bit in ACR and IEDG bit in TCR.
Software write
Software
1VCAP falls to VSS.
Wait out minimum tDIS time
VMAX, IDIS, CEXT
2
Stop discharge and begin charge when
the next TOF sets the CHG control bit
in ACR.
Timer TOF sets the CHG control
bit in the ACR.
Free-running timer
counter overflow, fOSC
3
VCAP rises to VX and comparator 2
output trips, setting CPF2 and CMP2,
which causes an ICF from the timer
and clears the CHG control bit in ACR.
Must clear CPF2 in order to trap next
CPF2 flag.
Wait out tCHG time
Timer ICF clears the CHG
control bit in the ACR.
VX, ICHG, CEXT
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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