h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 492

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Table 19.3 External Clock Input Conditions
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 19.4 shows the external clock output
stabilization delay time. Figure 19.6 shows the timing of the external clock output stabilization
delay time.
Table 19.4 External Clock Output Stabilization Delay Time
Condition: V
Note:
Rev. 1.00, 05/04, page 458 of 544
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 t
Clock pulse width high
level
Item
External clock output stabilization delay
time
DEXT
*
) has passed. As the clock signal output is not determined during the t
t
DEXT
CC
= 3.0 V to 3.6 V, V
includes a RES pulse width (t
EXTAL
t
EXr
Figure 19.5 External Clock Input Timing
Symbol
t
t
t
t
t
EXL
EXH
EXr
EXf
CL
CH
SS
= 0 V
Min
40
40
—
—
0.4
80
0.4
80
t
EXH
V
Symbol
t
DEXT
CC
RESW
=3.0 to 3.6 V
*
).
Max
—
—
10
10
0.6
—
0.6
—
Min.
500
t
EXf
t
EXL
Unit
ns
ns
ns
ns
t
ns
t
ns
cyc
cyc
Max.
—
Test Conditions
Figure 19.5
φ ≥ 5 MHz
φ < 5 MHz
φ ≥ 5 MHz
φ < 5 MHz
V
CC
Unit
µs
× 0.5
DEXT
cycle, a reset
Remarks
Figure 19.6
Figure 22.5