R0E00008AKCE00EP52 Datasheet, PDF (23/43 Pages) Renesas Technology Corp – Microcomputer Development Environment System

E8a Emulator
4. Examples of Pin Handling for Connecting the E8a
(1) SCLK, RxD, TxD and BUSY pins
Pins P44(BUSY), P45(SCLK), P46(RxD) and P47(TxD) are used exclusively by the E8a emulator.
Connect pins P46 and P47 to the E8a emulator after pulling up the MCU pins at the Vcc (Vcc1) level.
For P44 and P45, pull up the pins at the Vcc (Vcc1) level or pull down them according to the MCU pin state after
disconnecting the E8a emulator.
P44 may be in a Hiz state while the E8a emulator is active. Therefore, set the pin resistance value so the voltage cannot be at
the midpoint potential, depending on the voltage dividing of the resistance inside the E8a emulator (Figure 4.24 on page 26).
E8a Connecting
Connector
1
SCLK
11
RxD
5
TxD
9
BUSY
Vcc Vcc
(Vcc1) (Vcc1)
Pulled up at
4.7kΩ or more
P45/SCLK
P46/RxD
P47/TxD
MCU
P44/BUSY
Figure 4.19 E8a Emulator and MCU Connection (R32C/160 and R32C/161 Only)
REJ10J1877-0201 Rev.2.01 Jun. 26, 2009
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