R0E00008AKCE00EP52 Datasheet, PDF (14/43 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 P64(BUSY), P65(SCLK), P66(RxD) and P67(TxD) are used exclusively by the E8a emulator.
Connect pins P66 and P67 to the E8a emulator after pulling up the MCU pins at the Vcc (Vcc1) level.
For P64 and P65, pull up the pins at the Vcc (Vcc1) level or pull down them according to the MCU pin state after
disconnecting the E8a emulator.
P64 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
P65/SCLK
P66/RxD
P67/TxD
MCU
P64/BUSY
Figure 4.5 E8a Emulator and MCU Connection (MCUs Other Than R32C/160 and R32C/161)
REJ10J1877-0201 Rev.2.01 Jun. 26, 2009
Page 14 of 43