MB90F543 Ver la hoja de datos (PDF) - Fujitsu

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MB90F543

16-bit Proprietary Microcontroller

Fujitsu 

MB90540/540G/545/545G Series

(12) Indeterminate outputs from ports 0 and 1 (MB90F543/F549/V540/V540G only)

During oscillation setting time of step-down circuit (during a power-on reset) after the power is turned on, the

outputs from ports 0 and 1 become following state.

• If RST pin is “H”, the outputs become indeterminate.

• If RST pin is “L”, the outputs become high-impedance.

Pay attention to the port output timing shown as follow.

• RST pin is “H”

Oscillation setting time*2

Power-on reset*1

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

KB (internal operation clock B) signal

PORT (port output) signal

Period of indeterminated

*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)

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