MB90352 Ver la hoja de datos (PDF) - Fujitsu

Número de pieza

componentes Descripción

Fabricante

MB90352

16-bit Proprietary Microcontroller

Fujitsu 

MB90350 Series

11. Notes on Energization

To prevent the internal regulator circuit from malfunctioning, set the voltage rise time during energization at 50

or more µs (0.2 V to 2.7 V)

12. Stabilization of power supply voltage

A sudden change in the supply voltage may cause the device to malfunction even within the specified VCC supply

voltage operating range. Therefore, the VCC supply voltage should be stabilized.

For reference, the supply voltage should be controlled so that VCC ripple variations (peak-to-peak value) at

commercial frequencies (50 Hz to 60 Hz) fall below 10% of the standard VCC supply voltage and the coefficient

of fluctuation does not exceed 0.1 V/ms at instantaneous power switching.

13. Initialization

In the device, there are internal registers which are initialized only by a power-on reset. To initialize these registers,

turn on the power again.

14. Port 0 to port 3 output during Power-on (External-bus mode)

As shown below, when power is turned on in External-Bus mode, there is a possibility that output signal of

Port 0 to Port 3 might be unstable.

VCC

1/2 VCC

Port0 to Port3

Port0 to Port3 outputs Port0 to Port3 outputs = Hi-Z

might be unstable

15. Notes on using CAN Function

To use CAN function, please set ’1’ to DIRECT bit of CAN Direct Mode Register (CDMR).

If DIRECT bit is set to ’0’ (initial value), wait states will be performed when accessing CAN registers.

Please refer to Hardware Manual of MB90350 series for detail of CAN Direct Mode Register.

16. Flash security Function

The security byte is located in the area of the flash memory.

If protection code 01H is written in the security bit, the flash memory is in the protected state by security.

Therefore please do not write 01H in this address if you do not use the security function.

Please refer to following table for the address of the security bit.

Flash memory size

Address for security bit

MB90F352

Embedded 1 Mbit Flash Memory

FE0001H

18

Share Link: