h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 690
h8s-2161b
Manufacturer Part Number
h8s-2161b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2161B.pdf
(845 pages)
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Section 24 Clock Pulse Generator
Table 24.3 External Clock Input Conditions
Item
External clock
input pulse width
low level
External clock
input pulse width
high level
External clock
rising time
External clock
falling time
Clock pulse width
low level
Clock pulse width
high level
The oscillator and duty correction circuit have a function to adjust the waveform of the external
clock input that is input to the EXTAL pin. When a specified clock signal is input to the EXTAL
pin, internal clock signal output is determined after the external clock output stabilization delay
time (t
signal should be set to low to hold it in reset state. Table 24.4 shows the external clock output
stabilization delay time. Figure 24.6 shows the timing of the external clock output stabilization
delay time.
Rev. 3.00 Mar 21, 2006 page 636 of 788
REJ09B0300-0300
DEXT
) has passed. As the clock signal output is not determined during the t
EXTAL
Symbol Min
t
t
t
t
t
t
EXL
EXH
EXr
EXf
CL
CH
t
EXr
Figure 24.5 External Clock Input Timing
V
40
40
—
—
0.4
80
0.4
80
CC
= 2.7 to 3.6 V
t
Max
—
—
10
10
0.6
—
0.6
—
EXH
V
Min
20
20
—
—
0.4
80
0.4
80
CC
= 5.0 V
t
EXf
t
EXL
Max
—
—
5
5
0.6
—
0.6
—
10
Unit
ns
ns
ns
ns
t
ns
t
ns
cyc
cyc
V
CC
× 0.5
Test Conditions
Figure 24.5
DEXT
< 5 MHz
5 MHz
5 MHz
5 MHz
cycle, a reset
Figure
28.6
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