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SH-2 Datasheet(PDF) 83 Page - Renesas Technology Corp

Part # SH-2
Description  SuperHTM RISC engine
PDF  919 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH-2 Datasheet(HTML) 83 Page - Renesas Technology Corp

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57
Input clock (EXTAL pin)
System clock (CK pin)
Internal clock (
φ)
Peripheral clock (P
φ)
Figure 4.2 Input Clock and System Clock
4.3
Clock Source
Clock pulses can be supplied from a connected crystal resonator or an external clock.
4.3.1
Connecting a Crystal Oscillator
Circuit Configuration: Figure 4.3 shows an example of connecting a crystal resonator. Use the
damping resistance (Rd) shown in table 4.3. An AT-cut parallel-resonance type crystal resonator
should be used. Load capacitors (CL1, CL2) must be connected as shown in the figure.
The clock pulses generated by the crystal resonator and internal oscillator are sent to the PLL
multiplier circuit, where a multiplied frequency is selected and supplied inside the
SH7052F/SH7053F/SH7054F chip and to external devices.
The crystal oscillator manufacturer should be consulted concerning the compatibility between the
crystal oscillator and the chip.
XTAL
EXTAL
CL2
CL1
Rd
CL1 = CL2 = 18 to 22 pF (recommended value)
Figure 4.3 Connection of Crystal Oscillator (Example)



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