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H8/3003 数据表(PDF) 527 Page - Renesas Technology Corp

部件名 H8/3003
功能描述  microcontroller (MCU)
PDF  715 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3003 数据表(HTML) 527 Page - Renesas Technology Corp

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External Clock
•
Clock-halving version
The external clock signal should have a frequency equal to twice the system clock frequency
(ø) and a duty cycle of 40% to 60%.
•
1:1 version
The external clock frequency should be equal to the system clock frequency (ø). Table 16-3
and figure 16-6 indicate the clock timing.
Table 16-3 Clock Timing
VCC = 2.7 to 5.5 V VCC = 5.0 V ± 10%
Item
Symbol
Min
Max
Min
Max
Unit Test Conditions
External clock rise
tEXr
—10
—
5
ns
time
External clock fall
tEXf
—10
—
5
ns
time
—
30
70
30
70
%
ø
≥ 5 MHz
40
60
40
60
%
ø < 5 MHz
—
40
60
40
60
%
Figure 16-6 External Clock Input Timing
EXTAL
tEXr
tEXf
a
tcyc
VCC × 0.5
Ø
b
tcyc
VCC × 0.5
External clock
input duty (a/tcyc)
ø clock width
duty (b/tcyc)
Figure
16-6
509



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