upd75238 Renesas Electronics Corporation., upd75238 Datasheet - Page 54
upd75238
Manufacturer Part Number
upd75238
Description
4 Bit Single-chip Microcomputer
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD75238.pdf
(190 pages)
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54
(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.
Caution When an external clock is used, the STOP mode cannot be set. This is because the X1 pin is
(a) Crystal/ceramic oscillation
connected to V
Crystal
oscillator
or ceramic
oscillator
Fig. 4-17 External Circuitry for the Main System Clock Oscillator
X1
X2
SS
in the STOP mode.
PD75238
External
clock
(b) External clock
X1
X2
PD75238
PD75238
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