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MB90580C Datasheet(PDF) 21 Page - Fujitsu Component Limited.

Part No. MB90580C
Description  16-bit Proprietary Microcontroller
Download  110 Pages
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Manufacturer  FUJITSU [Fujitsu Component Limited.]
Direct Link  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB90580C Datasheet(HTML) 21 Page - Fujitsu Component Limited.

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MB90580C Series
21
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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