MB90F543 Ver la hoja de datos (PDF) - Fujitsu

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MB90F543

16-bit Proprietary Microcontroller

Fujitsu 

MB90540/540G/545/545G Series

• RST pin is “L”

VCC (Power-supply pin)

PONR (power-on reset) signal

RST (external asynchronous reset) signal

RST (internal reset) signal

Oscillation clock signal

KA (internal operation clock A) signal

Oscillation setting time*2

Power-on reset*1

KB (internal operation clock B) signal

PORT (port output) signal

High-impedance

*1 : Power-on reset time : Period of “clock frequency × 217” (Clock frequency of 16 MHz : 8.19 ms)

*2 : Oscillation setting time : Period of “clock frequency × 218” (Clock frequency of 16 MHz : 16.38 ms)

(13) Initialization

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

please turn on the power again.

(14) Directions of “DIV A, Ri” and “DIVW A, RWi” instructions

In the Signed multiplication and division instructions (“DIV A, Ri” and “DIVW A, RWi”) , the value of the corre-

sponding bank register (DTB, ADB, USB, SSB) is set in “00H”.

If the values of the corresponding bank registers (DTB, ADB, USB, SSB) are set to other than “00H”, the remainder

by the execution result of the instruction is not stored in the register of the instruction operand.

(15) Using REALOS

The use of EI2OS is not possible with the REALOS real time operating system.

(16) Caution on Operations during PLL Clock Mode

If the PLL clock mode is selected, the microcontroller attempt to be working with the self-oscillating circuit even

when there is no external oscillator or external clock input is stopped. Performance of this operation, however,

cannot be guaranteed.

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