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E8a Emulator Section 5 Examples of E8a Connections

Points to Remember

1. Pins P64, P65, P66 and P67 are used exclusively by the E8a emulator. Connect the E8a emulator to the MCU pins.

Connect pins P66 and P67 to the E8a emulator after pulling up the MCU pins at the Vcc level. For P64 and P65, pull

up the pins at the Vcc 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 5.8).

Figure 5.3 E8a Emulator and MCU Connection

2. The E8a emulator uses pins P50 and P55 for MCU control. Connect the E8a emulator to the MCU pins.

(1) In single-chip mode

For P50 and P55, pull up the pins at the Vcc level or pull down them according to the MCU pin state

after disconnecting the E8a emulator. P50 and P55 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 5.8).

Figure 5.4 Connection of E8a Emulator and Pins P50 and P55 (Single-chip Mode)

REJ10J1639-0500

Rev.5.00 Page 7 of 23

P65/SCLK

P67/TxD

Pulled up at

4.7k

or more

User system

connector

P64/BUSY

P66/RxD

M16C/30P

P65

P67

P66

P64

Vcc

Apr.30.10

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