MB91F155PFV-G Просмотр технического описания (PDF) - Fujitsu

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MB91F155PFV-G

32-bit Proprietary Microcontrollers

Fujitsu 

MB91F155/MB91154

to the X0 and X1 pins simultaneously. However, when using the clock along with STOP (oscillation stopped)

mode, the X1 pin stops when “H” is input in STOP mode. To prevent one output from competing against another,

an external resistor of about 1 kΩ should be provided.

The following figure shows an example usage of an external clock.

Figure 2.1 An example usage of an external clock

X0

X1

MB91F155/MB91154

4. Care During Powering Up

• When powering up

When turning on the power supply, never fail to start from setting the RST pin to “L” level. And after the power

supply voltage goes to VCC level, at least after ensuring the time for 5 machine cycle, then set to “H” level.

• Source oscillation input

At turning on the power supply, never fail to input the clock before cancellation of the oscillation stabilizing

waiting.

• Power on resetting

When powering up or when turning the power back on after the supply voltage drops below the operation

assurance range, be sure to reset the power.

• Power on sequence (When Vcc2 is connected to Vcc)

Turn on the power in the order of Vcc, AVcc and AVRH. The power should be disconnected in inverse order.

• Even when an AD converter is not in use, connect AVcc to the Vcc level and AVss to the Vss level.

• Even when a DA converter is not in use, connect DAVC to the Vcc level and DAVS to the Vss level.

5. Powering Up and Backup Mode

This product type has a backup RAM and a Vcc2 power supply dedicated to the calendar macro. With respect

to the Vcc2 and backup pin, adhere to the following :

• When turning on only Vcc2 with Vcc turned off, be sure that the BACK UP pin is on the “L” level.

• Be sure that the BACK UP pin reaches the “H” level after Vcc is turned on. When Vcc is off, the BACK UP pin

must be on the “L” level.

• When setting the BACK UP pin from the “H” to “L” level, be sure that the CPU is in stop mode.

VCC2 ON VCC ON

CPU

operation

VCC

VCC2

BACK UP

Note : Do not turn on Vcc from Vcc2 off state.

VCC OFF

VCC ON

STOP

mode

Backing up

in progress

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