HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 107

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

Table 7.3
t
t
standard)
7.3
Board design: When designing the board, place the crystal resonator and its load capacitors as
close as possible to the XTAL and EXTAL pins. Route no other signal lines near the XTAL and
EXTAL pin signal lines to prevent induction from interfering with correct oscillation. See figure
7.6.
EXr/f
EXH/L
(V
(1/2 V
IL
–V
Usage Notes
IH
CC
Input Clock Specifications
)
1/2 V
External clock input
cc
VIL
t
EXr
5 V Specifications
(fmax = 20 MHz)
Max = 5
Min = 10
Figure 7.4 External Clock Input Method
VIH
Figure 7.5 Input Clock Waveform
t
EXH
t
cyc
t
EXf
3.3 V Specifications
(fmax = 12.5 MHz)
Max = 10
Min = 20
Open
t
EXL
XTAL
EXTAL
Units
ns
ns
HITACHI 91