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HD404612FS Datasheet(PDF) 37 Page - Renesas Technology Corp

Part # HD404612FS
Description  4-Bit Single-Chip Microcomputer
PDF  91 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404612FS Datasheet(HTML) 37 Page - Renesas Technology Corp

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HD404618 Series
35
Internal Oscillator Circuit
Figure 21 shows a block diagram of the internal oscillator circuit. A ceramic oscillator can be connected to
OSC
1 and OSC2, and a 32.768-kHz crystal oscillator can be connected to X1 and X2. The system oscillator
can also be operated by an external clock.
f
OSC
X2
X1
Subsystem
oscillator
Divider
(1/4)
Divider
(1/8)
Mode
control
circuit
Timing
generator
OSC
f X
cyc
f SUB
f
Timing
generator
System clock
(ø
)
CPU
System clock
(ø
)
PER
Timer-base
clock (ø
)
CLK
OSC
System
oscillator
1
2
Figure 21 Internal Oscillator Circuit
D0
RESET
OSC2
OSC1
VCC
VTref
COMP1/D13
TEST
X1
X2
GND
SCK/R00
GND
Figure 22 Layout of Crystal and Ceramic Oscillators



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