Fujitsu MB2147-01 User Data Bus Switching, Set the setting of the user data bus selection switch

CHAPTER 3 OPERATING THE EMULATOR

3.6User Data Bus Switching

Set the setting of the user data bus selection switch.

■Switching of the user data bus

CAUTION

Make sure that power to the product is turned off and the power plug is

Prohibition disconnected from outlets before handling switches. Doing so may result in device problems or electric shock.

If probing target pins (P00 to P07 and P10 to P17) have special specifications, such as for high- voltage ports, the user data bus probing circuit must be set to the disconnected status.

When the external bus of the evaluation MCU is not used, the disconnected status is the recommended setting for the user data bus probing circuit.

Using the user data bus selection switch on the emulator, set the user data bus probing circuit to the connected or disconnected status.

Figure 3.6-1"Configuration of the peripheral circuit for the user data bus selection switch" shows the configuration of the peripheral circuit for the user data bus selection switch. Table 3.6-1"Settings of user data bus selection switch" lists switch settings.

Table 3.6-1 Settings of user data bus selection switch

Probing target pin		1	2	3	4	5	6	7	8
P00 to P07	Connected	ON	ON	ON	ON	ON	ON	ON	ON
(P0 SENSE setting)
	Disconnected	OFF	OFF	OFF	OFF	OFF	OFF	OFF	OFF
P10 to P17	Connected	ON	ON	ON	ON	ON	ON	ON	ON
(P1 SENSE setting)
	Disconnected	OFF	OFF	OFF	OFF	OFF	OFF	OFF	OFF

Note:

This circuit has a function equivalent to that of a pull-up circuit with high resistance.

If all buses in the evaluation MCU and user system are in the Hi-Z state, about 3.0 V appears on the user data bus.

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