Reset Input Switching - Oki Dr.63514 User Manual

Chapter 2. Functions

2.9 Reset Input Switching

The reset signal to the evaluation chip in the emulator normally comes from the emulator's main control
CPU. There is, however, a setting for adding user cable reset (RESETB) input.
VDD
I/O
Mask option
C
I/O
RESET
(User cable)
VIH
VIL
A built-in voltage conversion circuit converts the user cable reset (RESETB) input to the internal "H"
level from VDD, the positive power supply voltage (0.9 to 5 V).
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n Note 1 n
User cable reset (RESETB) input is only relevant during evaluation and real-time emulation. It
is always prohibited during single-step emulation.
________________________________________________________________________________________________________________________________
________________________________________________________________________________________________________________
n Note 2 n
The RESETB pin is only enabled during periods when the RUN LED is lit. In particular, reset
signal input to the RESETB pin from the user application system is disabled while the
Dr.63514 in-circuit emulator is initializing and after real-time emulation has been forcibly
terminated.
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2-38
Reset signal
30kΩ
from main CPU
Reset switch
HC4066
signal
+
+
-
-
AD826 MAX901
+
-
MAX901
Figure 2-17 Reset Input
D Q
CLK
Reset input to
evaluation chip