R0E00008AKCE00EP52 Datasheet, PDF (25/43 Pages) Renesas Technology Corp – Microcomputer Development Environment System

E8a Emulator
4. Examples of Pin Handling for Connecting the E8a
(3) CNVss pin
The E8a emulator uses the CNVss pin for MCU control.
Pull down the E8a emulator and MCU pins and connect the E8a emulator.
E8a Connecting
Connector
3
CNVss
CNVss
MCU
Pulled down at
4.7kΩ or more
Figure 4.22 E8a Emulator and CNVss Pin Connection
(4) RESET# pin
The RESET# pin is used by the E8a emulator. Therefore, use an open-collector output buffer or a CR reset circuit as the reset
circuit for the user system. The recommended pull-up value is 4.7 kΩ or more. The MCU can be reset by outputting “L” from
the E8a emulator. However, if the reset IC output is “H”, the user system reset circuit cannot be set to “L”. As such, the E8a
emulator will not operate normally.
Vcc
E8a Connecting
User
*
Connector
logic
13
RESET#
Pulled up at 4.7kΩ or more
RESET#
MCU
*: Open-collector buffer
Figure 4.23 Example of a Reset Circuit
(5) Other pins
ô Connect Vss and Vcc to the Vss and Vcc of the MCU, respectively.
ô The amount of voltage input to Vcc must be within the specified range of the MCU.
ô If NMI# interrupts are not used, make sure the NMI# pin is pulled up to the Vcc pin through a resistor.
ô Pin 14 is used for checking the connection between the E8a and the user system, and is not directly connected to the
Vss inside the E8a. Make sure that pins 2, 6, 10, 12 and 14 are all connected to the Vss.
REJ10J1877-0201 Rev.2.01 Jun. 26, 2009
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