MB90F548GPF datasheet(19/70 Pages) CYPRESS

Nome de Peças	MB90F548GPF

Descrição Electrónicos	CMOS F2MC-16LX MB90540G/545GSeries 16-bit Proprietary Microcontroller

PDF	70 Pages

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Fabricante Electrônico	CYPRESS [Cypress Semiconductor]

Página de início	http://www.cypress.com

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19 / 70 page

Document Number: 002- 07696 Rev. *A

Page 19 of 70

MB90540G/545G Series

(12) Indeterminate outputs from ports 0 and 1 (MB90V540G 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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