MB91F528 datasheet(56/241 Pages) SPANSION

56 / 241 page

D a t a S h e e t

March 28, 2014, MB91F528_DS705-00016-1v0-E

CONFIDENTIAL

 Crystal oscillation circuit

An external noise to the X0 or X1 pin may cause a device malfunction. The printed circuit board must be

designed to lay out X0 and X1 pins, crystal oscillator (or ceramic resonator), and the bypass capacitor to be

grounded to the close position to the device.

The printed circuit board artwork is recommended to surround the X0 and X1 pins by ground circuits.

 Mode pins (MD1, MD0)

Connect the MD1and MD0 mode pins to the VCC or VSS pin directly. To prevent an erroneous selection of

test mode caused by the noise, reduce the pattern length between each mode pin and VCC or VSS pin on the

printed circuit board. Also, use the low-impedance pin connection.

 During power-on

To prevent a malfunction of the voltage step-down circuit built in the device, set the voltage rising time to

have 50μs or longer (between 0.2V and 2.7V) during power-on.

 Notes during PLL clock operation

When the PLL clock is selected and if the oscillator is disconnected or if the input is stopped, this clock

may continue to operate at the free running frequency of the self-oscillator circuit built in the PLL clock.

This operation is not guaranteed.

 Treatment of A/D converter power supply pins

Connect the pins to have AVCC=AVRH=VCC and AVSS/AVRL=VSS even if the A/D converter is not used.

 Notes on using external clock

An external clock is not supported. None of the external direct clock input can be used for both main clock

and sub clock.

 Power-on sequence of A/D converter analog inputs

Be sure to turn on the digital power supply (VCC, VCCE) first, and then turn on the A/D converter power

supplies (AVcc, AVRH, AVRL) and analog inputs (AN0 to AN63). Also, turn off the A/D converter power

supplies and analog inputs first, and then turn off the digital power supply (VCC, VCCE). When the AVRH

pin voltage is turned on or off, it must not exceed AVCC. Even if a common analog input pin is used as an

input port, its input voltage must not exceed AVcc. (However, the analog power supply and digital power

supply can be turned on or off simultaneously.)

 Treatment of C pin

This device contains a voltage step-down circuit. A capacitor must always be connected to the C pin to

assure the internal stabilization of the device. For the standard values, see the "Recommended Operating

Conditions" of the latest data sheet.

Note: Please see the latest data sheet for a detailed specification of the operation voltage.

 Function switching of a multiplexed port

To switch between the port function and the multiplexed pin function, use the PFR (port function register).

However, if a pin is also used for an external bus, its function is switched by the external bus setting. For

details, see " I/O PORTS" in the hardware manual.

MB91F528 데이터시트(PDF) 56 Page - SPANSION