NEC PD750004 Manuale Utente
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µPD750008 USER'S MANUAL
2.2.14 XT1, XT2
These pins are used for connection to a crystal for subsystem clock oscillation.
An external clock can also be applied.
(a) Crystal oscillation
(b) External clock
2.2.15 RESET
This is the pin for active-low reset input.
The RESET input is asynchronous. When a signal with certain low level width is applied to the pin, a RESET
signal is generated to cause a system reset, which has priority over any other operations.
The RESET signal is used for normal CPU initialize/start operation, and is also used to release the standby
(STOP or HALT) mode.
A Schmitt-triggered input is used for the RESET input pin.
2.2.16 V
DD
This is the positive power supply pin.
2.2.17 V
SS
This is the ground pin.
V
SS
XT1
XT2
Crystal
µPD750008
(Standard frequency:
32.768 kHz)
32.768 kHz)
XT1
XT2
External
clock
clock
µPD750008