Oki Dr.63514, User Manual, Page: 83 / 101

Chapter 4. Additional Usage Notes
4-8
6. RESETB terminal
Reset inputs to the RESETB pin can be enabled or disabled with commands. This pin can be set to use
either an internal pull-up resistor or and external pull-up resistor with the mask option function. Mask
option data settings in the Dr.63514 in-circuit emulator are implemented by defining the mask option
data allocation area at location 0FE2H (1FE2H) in code memory in the same manner as in the
ML63512/514.
RESET
Reset input to
evaluation chip
Reset signal from
main CPU
Reset switch
signal
30k Ω
C
I/O
I/O
Mask option
RESET circuit
(LCA)
HC4066
VDD
MAX901
operational amplifier
10k
Ω
30k
Ω
10k
Ω
MAX901
AD826
D
CLK
Q
+
-
+
-
+
-
+
-
+
-
VDD
Figure 4-8 RESETB terminal
Also note that the input circuit discussed above have the following hysteresis characteristics.
Table 4-1 User interface circuit hysteresis characteristics
ML63512/514 Dr.63514
VIL VIH VIL VIH
VDD=1.5V 0.3V 1.2V 0.3V 0.7V
VDD=3.0V 0.6V 2.4V 0.5V 1.6V
VDD=5.0V 1.0V 4.0V 0.8V 2.6V
Table 4-2 Hysteresis value (rated value)
ML63512/514(Typ.) Dr.63514(Typ.)
VDD=1.5V 0.1V 0.40V
VDD=3.0V 0.5V 1.10V
VDD=5.0V 1.0V 1.80V