參數(shù)資料
型號: MC68HRC705JP7CP
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, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 150/164頁
文件大小: 1165K
代理商: MC68HRC705JP7CP
Analog Subsystem
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
86
Freescale Semiconductor
Figure 8-9. A/D Conversion — Manual/Auto Discharge Control (Mode 1)
Point
Action
Software/Hardware Action
Dependent Variable(s)
0
Begin initial discharge and select mode
1 by clearing CHG and ATD2 and setting
ATD1 in the ACR.
Software write
Software
1
VCAP falls to VSS.
Wait out minimum tDIS time.
VMAX, IDIS, CEXT
2
Stop discharge and begin charge by
setting CHG control bit in ACR.
Software write
Software
3
VCAP rises to VX and comparator 2
output trips, setting CPF2 and CMP2,
which clears CHG control bit in the ACR.
Reset CPF2 by writing a 1 to CPFR2.
Wait out tCHG time.
CPF2 clears CHG control bit.
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
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