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| MC68HC705JJ7 Datasheet, PDF (85/164 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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VCAP
VX
tDIS
tDIS
(MIN)
tMAX
tCHG
A/D Conversion Methods
tDIS
(MIN)
VMAX
VX = tCHG x ICHG
CEXT
CHG
COMP2
TOF
OCF
ICF
0
2
3
45
1
1
Point
Action
Software/Hardware Action
Dependent Variable(s)
Begin initial discharge and select mode 0 by
0 clearing the CHG, ATD2, and ATD1 control bits Software write
in the ACR.
Software
1 VCAP falls to VSS.
2
Stop discharge and begin charge by setting
CHG control bit in ACR.
Wait out minimum tDIS time.
Software write
VMAX, IDIS, CEXT
Software
3
VCAP rises to VX and comparator 2 output trips,
setting CPF2 and CMP2.
Wait out tCHG time.
VX, ICHG, CEXT
4 VCAP reaches VMAX.
None
Begin next discharge by clearing the CHG
5 control bit in the ACR. Reset CPF2 by writing a Software write
1 to CPFR2.
VMAX, ICHG, CEXT
Software
Figure 8-8. A/D Conversion â Full Manual Control (Mode 0)
MC68HC705JJ7 ⢠MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
85
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