UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 54

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UPD75238GJ

Manufacturer Part Number
UPD75238GJ
Description
4 BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC [NEC]
Datasheet
(5) System clock oscillator
The main system clock oscillator operates with a crystal (6.0 MHz standard) or ceramic resonator
connected to the X1 and X2 pins.
An external clock can also be input.
Fig. 4-17 External Circuitry for the Main System Clock Oscillator
(a) Crystal/ceramic oscillation
PD75238
X1
X2
Crystal
oscillator
or ceramic
oscillator
Caution When an external clock is used, the STOP mode cannot be set. This is because the X1 pin is
connected to V
in the STOP mode.
SS
54
(b) External clock
PD75238
External
X1
clock
X2
PD75238

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