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SH7021 Datasheet(PDF) 110 Page - Renesas Technology Corp

Part # SH7021
Description  SuperH??RISC engine
PDF  509 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7021 Datasheet(HTML) 110 Page - Renesas Technology Corp

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92 RENESAS
XTAL
EXTAL
C
L1
C
L2
No crossing
signal lines
Figure 7.6 Precaution on Oscillator Circuit Board Design
Duty cycle correction circuit: Duty cycle corrections are conducted for an input clock over 5
MHz. Duty cycles may not be corrected if under 5 MHz, but AC characteristics for the high-level
pulse width (tCH) and low-level pulse width (tCL) of the clock are satisfied, and the LSI will
operate normally. Figure 7.7 shows the standard characteristics of a duty cycle correction.
This duty cycle correction circuit is not for correcting the input clock's transient fluctuations and
jutters.
70
60
50
40
30
12
5
10
20
(MHz)
70
60
50
40
30
Input duty
Input frequency
Figure 7.7 Duty Cycle Correction Circuit Standard Characteristics



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