參數(shù)資料
型號: MC68HC705JJ7CDW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: SOIC-20
文件頁數(shù): 151/164頁
文件大小: 1165K
代理商: MC68HC705JJ7CDW
A/D Conversion Methods
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
87
Figure 8-10. A/D Conversion — TOF/ICF Control (Mode 2)
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
1
VCAP 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 to trap
next CPF2 flag.
Wait out tCHG time.
Timer ICF clears the CHG control bit
in the ACR.
VX, ICHG, CEXT
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)
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