MC68HC705JP7 Datasheet, PDF (111/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Analog Subsystem
Analog Multiplex Register
V_DD
INTERNAL
TEMPERATURE
DIODE
CHANNEL
SELECTION
BUS
PB0 ₊
COMP2
–
80 kΩ
80 kΩ
SAMPLE
CAP
V_SS
OFFSET
VOFF
OPT (MOR)
HOLD
DHOLD
Figure 8-3. Comparator 2 Input Circuit
Table 8-1. Comparator 2 Input Sources
Case
HOLD DHOLD OPT VOFF Voltage
(AMUX) (AMUX) (MOR) (ASR) Offset
Source To Negative Input
of Comparator 2
Hold
sample
0
voltage
0
X⁽¹⁾
Sample capacitor connected to
No comparator 2 negative input; very low leakage
1
0
current.
0
Sample capacitor connected to comparator 2
negative input; bottom of capacitor offset from
1
1
Yes _{VSS by approximately 100 mV, very low}
leakage current.
Divide input
0
Signal on channel selection bus is divided
1
X⁽¹⁾
X⁽¹⁾
No by 2 and connected to sample capacitor
and comparator 2 negative input
Direct input
1
Signal on channel selection bus is connected
0
X⁽¹⁾
X⁽¹⁾
No directly to sample capacitor and comparator 2
negative input.
Internal
temperature
1
diode
Internal temperature sensing diode connected
1
X⁽¹⁾
X⁽¹⁾
No directly to sample capacitor and comparator 2
negative input.
1. Don’t care
MC68HC705JJ7 • MC68HC705JP7 — REV 4
MOTOROLA
Analog Subsystem
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