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參數(shù)資料

型號(hào)：	MB90F548GLSPF
元件分類：	微控制器/微處理器
英文描述：	16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100
封裝：	PLASTIC, QFP-100
文件頁(yè)數(shù)：	11/67頁(yè)
文件大?。?/td>	746K
代理商：	MB90F548GLSPF

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.

Oscillation setting time*2

Power-on reset*1

Period of indeterminated

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

*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)

RST pin is “H”

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