HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 130

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

External Clock Input: The external clock signal should have the same frequency as the desired
system clock (ø). Clock timing parameters are given in table 6.7 and figure 6.12.
Table 6.7
Item
Low pulse width of external
clock input
High pulse width of external
clock input
External clock rise time
External clock fall time
Clock pulse
width low
Clock pulse
width high
Table 6.8 lists the external clock output stabilization delay time. Figure 6.13 shows the timing for
the external clock output stabilization delay time. The oscillator and duty correction circuit have
the function of regulating the waveform of the external clock input to the EXTAL pin. When the
specified clock signal is input to the EXTAL pin, internal clock signal output is confirmed after
the elapse of the external clock output stabilization delay time (t
confirmed during the t
maintained during this time.
98
EXTAL
Clock Timing
DEXT
Figure 6.12 External Clock Input Timing
period, the reset signal should be driven low and the reset state
Symbol
t
t
t
t
t
t
EXL
EXH
EXr
EXf
CL
CH
t
EXr
t
EXH
V
Min
40
40
—
—
0.3
0.4
0.3
0.4
CC
= 3.0 to 5.5 V
Max
—
—
10
10
0.7
0.6
0.7
0.6
t
EXt
Unit
ns
ns
ns
ns
t
t
t
t
DEXT
cyc
cyc
cyc
cyc
t
EXL
). As clock signal output is not
Test Conditions
Figure 6.12
ø
ø < 5 MHz
ø
ø < 5 MHz
5 MHz
5 MHz
V
CC
Figure 23.7
0.5