MB91F613 datasheet(28/104 Pages) FUJITSU

28 / 104 page

MB91610 Series

DS07-16907-2E

• Mode pins (MD0, MD1)

Connect the MD pin (MD0, MD1) directly to VCC or VSS pins. Design the printed circuit board such that the pull-

up/down resistance stays low, as well as the distance between the mode pins and VCC pins or VSS pins is as

short as possible and the connection impedance is low, when the pins are pulled-up/down such as for switching

the pin level and rewriting the Flash memory data. It is because of preventing the device erroneously switching

to test mode due to noise.

• Notes on power-on

• To ensure that the internal regulator and the oscillator have stabilized immediately after the power is turned

on, keep an “L” level input connected to the INIT pin for the duration of the regulator voltage stabilization wait

time + the oscillator start time of the oscillator + the main oscillator stabilization wait time.

• Turn power on/off in the following order

Turning on : VCC

→ AVCC → AVRH

Turning off : AVRH

→ AVCC → VCC

• Release the reset (INIT pin “L” level to “H” level) after the power supply has stabilized.

• Caution on operations during PLL clock mode

On this microcontroller, if in case the crystal oscillator breaks off or an external reference clock input stops while

the PLL clock mode is selected, a self-oscillator circuit contained in the PLL may continue its operation at its

self-running frequency.

However, Fujitsu Microelectronics will not guarantee results of operations if such failure occurs.

MB91F613 Datasheet(PDF) 28 Page - fujitsu semiconductor