HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 129

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

3.2.4
An external clock is input from the EXTAL pin or the CKIO pin, depending on the clock mode.
Clock Input from EXTAL Pin: This method can be used in clock modes 0, 1, 2, and 3.
Clock Input from CKIO Pin: This method can be used in clock modes 4, 5, and 6.
External Clock Input
CKPREQ/CKM
CKPREQ/CKM
Figure 3.3 External Clock Input Method
Figure 3.4 External Clock Input Method
EXTAL
XTAL
CKIO
EXTAL
XTAL
CKIO
Output or
high-impedance
Open
The CKPREQ/CKM pin is the clock
pause request input pin.
Open
Open
Ground level
The CKIO pin is an output
in clock modes 0, 1, and 2,
and is high-impedance in
clock mode 3.
External Clock Input
External Clock Input
111