MB90347CE datasheet(26/85 Pages) FUJITSU

26 / 85 page

MB90340E Series

•VCC ripple variations (peak-to-peak value) at commercial frequencies (50 Hz/60 Hz) fall below 10

% of the

standard VCC supply voltage

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

14. 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.

15. Port 0 to Port 3 Output During Power-on (External-bus Mode)

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

Port 0 to Port 3 might be unstable irrespective of the reset input.

16. Notes on Using the CAN Function

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

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

Note : Please refer to the Hardware Manual of the MB90340E series for detail of CAN Direct Mode Register.

17. Flash Security Function (except for MB90F346E)

A security bit 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.

Refer to following table for the address of the security bit.

Flash memory size

Address of the security bit

MB90F347E

Embedded 1 Mbit Flash Memory

FE0001H

MB90F342E

MB90F349E

Embedded 2 Mbits Flash Memory

FC0001H

MB90F343E

Embedded 3 Mbits Flash Memory

F90001H

MB90F345E

Embedded 4 Mbits Flash Memory

F80001H

Port0 to Port3 outputs

might be unstable

Port0 to Port3 outputs = Hi-Z

Port0 to Port3

VCC

1/2VCC

MB90347CE Datasheet(PDF) 26 Page - fujitsu semiconductor