MB91F577CSPMC datasheet(54/163 Pages) CYPRESS

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Document Number: 002-04725 Rev.*A

Page 54 of 163

MB91570 Series

The power supply pins should be connected to VCC pin and VSS pin of this device at the low impedance from the power supply

source.

In the area close to this device, a ceramic capacitor having the capacitance larger than the capacitor of C pin is recommended to

use as a bypass capacitor between the VCC pin and the VSS pin.

Crystal oscillation circuit

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

X0 pin and the X1 pin, 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 pin and X1 pin by ground circuits.

Mode pins (MD2, MD1, MD0)

Connect the MD2, MD1and MD0 mode pin to the VCC pin 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 pin 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 to 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 = Vcc5 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 voltage (Vcc) first, and then turn on the A/D converter power supply voltage (AVcc, AVRH,

AVRL) and analog input voltage (AN0 to AN39). Also, turn off the A/D converter power supplies and analog inputs first, and then

turn off the digital power supply voltage (Vcc5). 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

voltage and digital power supply voltage can be turned on or off simultaneously.)

Treatment of power supplies for high current output buffer pins (DVcc, DVss)

Be sure to turn on the digital power supply voltage (Vcc) first, and then turn on the power supply voltage for high current output

buffer pins (DVcc, DVss). Also, turn off the power supplies for high current output buffer pins first, and then turn off the digital power

supply voltage (Vcc).

Even if the high current output buffer pins are used as general-purpose ports, the power supply voltage of high current output buffer

pins (DVcc, DVss) must be powered. (The power supplies of high current output buffer pins and the digital power supplies 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.

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".

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