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| MC68HC705JP7 Datasheet, PDF (128/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
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Freescale Semiconductor, Inc.
Analog Subsystem
VCAP
VX
tDIS
tDIS
(MIN)
tMAX
tCHG
tDIS
(MIN)
VMAX
VX = tCHG x ICHG
CEXT
CHG
COMP2
TOF
OCF
ICF
0
2
1
3
45
1
Point
Action
Software/Hardware Action
Begin initial discharge and select mode 0
0 by clearing the CHG, ATD2, and ATD1
Software write
control bits in the ACR.
1 VCAP falls to VSS.
Wait out minimum tDIS time.
2
Stop discharge and begin charge by setting
CHG control bit in ACR.
Software write
3
VCAP rises to VX and comparator 2 output
trips, setting CPF2 and CMP2.
Wait out tCHG time.
4 VCAP reaches VMAX.
None
Begin next discharge by clearing the CHG
5 control bit in the ACR. Reset CPF2 by
Software write
writing a 1 to CPFR2.
Dependent Variable(s)
Software
VMAX, IDIS, CEXT
Software
VX, ICHG, CEXT
VMAX, ICHG, CEXT
Software
Figure 8-8. A/D Conversion â Full Manual Control (Mode 0)
Advance Information
128
MC68HC705JJ7 ⢠MC68HC705JP7 â REV 4
Analog Subsystem
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
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