Oki Dr.63514, User Manual, Page: 80 / 101

Chapter 4. Additional Usage Notes
4-5
With the input port usage setting (i.e. when the CMP switch is off), although comparator
can be used, the Dr.63514 cannot provide the same characteristics as the ML63512/514.
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Ÿ
Level detector port
Pins P7.2 and P7.3 in the ML63512/514 can be used as either input ports or as level detector inputs.
The Dr.63514 in-circuit emulator implements the input port block with discrete components and the level
detector block with an ML63514. However, the discrete components (circuits) in the input block
influence the characteristics of the level detector. Therefore, the port circuit is automatically
disconnected when the level detector is operating. This will achieves level detector characteristics
identical to those of the ML63512/514.
150k Ω
VDD
+5V
C
I/O
I/O
C
I/O
I/O
150k
Ω
C
I/O I/O
C
I/O I/O
LDPCHG
LDON
port hysteresis
circuit
port hysteresis
circuit
150k
Ω
analog input
(ML63514)
analog input
(ML63514)
LCA input
LCA input
LCA input
LCA input
LCA output
LCA output
HC4066 HC4066
HC4066
HC4066
HC4066
VDD
C
I/O I/O
+5V
150k Ω
HC4066
C
I/O I/O
port7.2
port7.3
Figure 4-4 P7.2, 7.3
n
Note 4
n
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Since the input port circuits are disconnected for ports used as level detectors during level
detector operation, they cannot be used as input ports.
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