NEC PD754244 Manuel D’Utilisation

User’s Manual  U10676EJ3V0UM

This is a reference voltage input pin.  An analog reference voltage for the programmable threshold port is input.

µPD754144 only)

These pins are used to connect the RC oscillator resistor (R) and capacitor (C) of the system clock oscillator.

No external clock can be input.

µ PD754144

V

SS

CL2

CL1

C

R

µPD754244 only)

These pins connect a crystal/ceramic oscillator for system clock oscillation.

An external clock can also be input to these pins.

This pin inputs an active-low reset signal.

The RESET signal is an asynchronous input signal and is asserted when a signal with a specific low-level width

is input to this pin regardless of the operating clock.  The RESET signal takes precedence over all the other operations.

This pin can not only be used to initialize and start the CPU, but also to release the STOP and HALT modes.

The RESET pin is a Schmitt-triggered input pin.

This pin can be connected to an internal pull-up resistor by a mask option.

ExternaI 

clock 

µ

X1

X2

Crystal resonator

or

ceramic resonator

V

SS

X1

X2

(4.194304 MHz TYP.)

µ PD754244