MB91F522DKBPMC datasheet(45/280 Pages) CYPRESS

45 / 280 page

Document Number: 002-04662 Rev. *F

Page 45 of 280

MB91520 Series

 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 MD1 and 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, the voltage rising must be monotonic 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) first, and then turn on the A/D converter power supplies (AVcc, AVRH, AVRL)

and analog inputs (AN0 to AN47). Also, turn off the A/D converter power supplies and analog inputs first, and then turn off the

digital power supply (Vcc). 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.

 Low-power consumption mode

To transit to the sleep mode, watch mode, stop mode, watch mode(power-off) or stop mode(power-off), follow the procedure

explained in "Activating the sleep mode, watch mode, or stop mode" or "Activating the watch mode (power-off) or stop

mode(power-off)" of " POWER CONSUMPTION CONTROL" in the hardware manual.

Take the following notes when using a monitor debugger.

•

Do not set a break point for the low-power consumption transition program.

•

Do not execute an operation step for the low-power consumption transition program.

MB91F522DKBPMC Datasheet(PDF) 45 Page - Cypress Semiconductor

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