MB90583C datasheet(21/110 Pages) FUJITSU

21 / 110 page

MB90580C Series

13. Indeterminate outputs from ports 0 and 1

The outputs from ports 0 and 1 become indeterminate during a power-on reset after the power is turned on.

Pay attention to the port output timing shown as follow.

14. Initialization

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

turning on the power again.

15. Return from standby state

If the power-supply voltage goes below the standby RAM holding voltage in the standby state, the device may

fail to return from the standby state. In this case, reset the device via the external reset pin to return to the

normal state.

16. Precautions for Use of ’DIV A, Ri,’ and ’DIVW A, RWi’ Instructions

The signed multiplication-division instructions ’DIV A, Ri,’ and ’DIVW A, RWi’ should be used when the corre-

sponding bank registers (DTB, ADB, USB, SSB) are set to value ’00h.’ If the corresponding bank registers (DTB,

ADB, USB, SSB) are set to a value other than ’00h,’ then the remainder obtained after the execution of the

instruction will not be placed in the instruction operand register.

17. Precautions for Use of REALOS

Extended intelligent I/O service (EI2OS) cannot be used, when REALOS is used.

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 indeterminate

Power-on reset*1

Oscillation settling time*2

*1: Power-on reset time: Period of “clock frequency x 217” (Clock frequency of 16 MHz: 8.192 ms)

*2: Oscillation settling time: Period of “clock frequency x 218” (Clock frequency of 16 MHz: 16.384 ms)

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